1 . Suppose you find a bright yellow bike on a street corner in the city. You hop on (跨上) it and _______. But wait — isn’t this stealing? No, it isn’t._______ shouts, “Stop! Thief!” That is _______ this free ride is just fine with the city.

You _______ find hundreds of free yellow bikes in some US cities. The idea began in Portland, Oregon, in 1994. People saw a need for _______ transportation, and they wanted to help _______ pollution. So, to get citizens (市民)_______ their cars and onto pollution-free bikes, they _______ the Yellow Bike Project.

The _______ bikes are painted bright yellow and placed throughout the city. People can hop on the yellow bike and ride to run errands (短程差事), to work ________ to school. Then, they leave the bike for the ________ rider. There have been times when bikes have been stolen, but most people ________ the rules, because they think it is not wise to ________ the bike that’s already free.

Portland’s ________ was quickly loved by a lot of people. Within two years of its starts, similar programs were ________ in cities in six other states.

3 . Joseph Dituri hasn’t seen the sun for days. The biomedical engineer has been underwater, with the goal of spending 100 days there in the name of ________. Dituri is living in Jules’ Undersea Lodge in Florida. The100-square-foot hotel is his intended home until the mission finishes, where he’ll ________ his research.

The submerged stay, if ________, will also break the previous record of 73 days set by two Tennessee educators in 2014.

During the project, Dituri is attempting to ________ the effects of living in a high-pressure environment for a(n)________ period. The human body has-never been underwater that long, so he will be ________ closely. For example, he’ll be ________ to electrocardiograms, which measure the heart’s function. “I ________ there will be improvements to my health,” Dituri said. His assumption is not made ________—a previous study indicated potential ________ of pressure exposure to cell growth. Dituri hopes this journey could ________ the treatment for age-related diseases.

Beyond research, the project is also a chance to promote ocean ________ “The ocean is in a bit of trouble,” Dituri said in a video. “We also want to use the attention that the 100-day mission would draw to________ young people’s curiosity and passion.” Dituri will invite about 40 children to stay with him for 24 hours at a time.

“________ I only stayed 60 days, I eventually would turn a whole bunch of kids on to the exploration of the sea. That would be a ________,” he said in an interview.

6 . Climate experts have warned about the many ways a warming planet can negatively affect human health. ________ global temperatures are predicted to increase by 1.5℃ by the 2030s, that risk is becoming increasingly real.

One long-held prediction that appears to be coming true — according to the results of a study recently published in Nature Scientific Reports — is how climate change might enhance ________ of bacteria that thrive and spread through warm sea waters and cause an infection with a particularly high ________ rate.

Vibrio vulnificus (创伤弧菌) flourishes in salty or brackish waters above 68℉. Infections are currently rare in the U.S., but that’s likely to change. Using 30 years of data on infections, scientists at the University of East Anglia in the U.K. found that Vibrio vulnificusis ________ from its historic Gulf Coast range, with more Northern states reporting infections as waters become warmer.

“We’re seeing the core ________ of infections extending to areas that traditionally have very few and very rare cases,” says Elizabeth Archer, a Ph.D. researcher and ________ author of the study. “But these areas are now coming into the main area of infections.”

Based on the latest data on how much the world’s water and air temperatures will rise, the scientists predict that by 2081, Vibrio vulnificus infections could reach every state along the U.S. East Coast. Currently, only about 80 cases are reported in the U.S. each year; by 2081, that could go up to over three-fold, the authors say.

Such a proliferation could have serious health consequences. Vibrio vulnificus kills approximately 20% of the healthy people it infects, and 50% of those with weakened immune systems. There is little evidence that antibiotics can ________ the infection, but doctors may prescribe them in some cases. People can get infected either by eating raw shellfish like oysters or by exposing small ________ to waters where the bacteria live, which can lead to serious skin infections.

Warming sea temperatures aren’t the only reasons behind the rise of Vibrio vulnificus. Hotter air also draws more people to the coasts and bays, bringing them into closer contact with the bacteria.

“The bacteria are part of the natural marine environment, so I don’t think we can ________ it from the environment,” says Archer. “It’s more about mitigating infections by increasing ________ of the risk.”

To alert people to the growing threat, ________ systems are needed to track when concentrations of bacteria start to rise, similar to currently available pollen and pollution alarm.

Vbrio vulnificus is so ________ to temperature changes that concentrations could bloom after even a day of warmer water, so consistent monitoring and alerts are critical, says Iain Lake, professor of environmental epidemiology at University of East Anglia and senior author of the paper.

Lake says the expansion of Vibrio vulnificus is concerning for public health since the bacteria are now invading waters closer to heavily ________ areas, such as New York and Philadelphia. “Everyone can get a Vibrio vulnificus infection,” he says. “But the more ________ there is between warmer waters and people, the more the bacteria can move into populations ________ the elderly and those with other health conditions, who are more vulnerable to infections.”

8 . My 5-year-old daughter Kai walked around a bus stop, picking up candy wrappers and plastic bottles and throwing them in the waste bin. We were a visiting family here, but she was cleaning the sidewalk, which didn’t shock me, nor was I _________ when strangers looked at us.

Our cleanup project began when we drove past an empty field one day and Kai _________ the field was covered by _________ balloons. We had read about how animals could _________ balloons for food. “Stop,” Kai said, and I _________. Surprisingly, we found the field was full of much trash _________ the balloons. “Can we come back and clean it?” Kai asked. Then each Friday, we returned to have a(n) _________ cleaning.

However, it seems we can never _________ the trash completely. I feel something close to _________! Why are we making kids clean up our __________? It has everything to do with the planet we adults are leaving for kids. Plastic pollution is globally distributed and microplastics have even been discovered in human blood. It is not a __________ story that we have created trash but our next generation cleans up them.

Now Kai hopes to become a marine biologist to protect sharks one day. She still has many years to __________, if adults get serious about solving plastic pollution. We shouldn’t leave our next generation a __________ planet and expect them to save it.

The last time our family was at the beach, we still picked up plastic bottles. Most __________, though, we saw an octopus (章鱼) playing around our feet, a __________ of a harmonious habitat worth protecting.

10 . All over the world, people admire the beauty and grace of butterflies. Butterflies come in every color imaginable, and their_________display an incredible variety of patterns. The largest butterfly, Queen Alexandra’s Birdwing, has a wingspan (翼展) of up to 280 millimeters and lives in Papua New Guinea. The smallest, the Western Pygmy Blue in the southern U.S., has a wingspan of only 12 millimeters. Sadly, some of these beautiful creatures are now _________.

Estimates indicate that between 15 and 20 thousand species of butterflies exist around the world. A number of these species are endangered, over 20 in Japan_________. Although that number may seem small, losing even one species would be_________. Nowadays scientists even look to butterflies as a _________of the environment’s health, since they are _________ to environmental changes. Many environmentalists around the world are eager to protect the endangered butterflies from extinction. The American Museum of Natural History in New York, for example, has an unusual butterfly exhibit. This exhibit _________ the important role that butterflies play in our environment.

In recent years, environmental groups have made significant progress in _________endangered butterfly populations. Governments throughout Asia have passed laws to help protect endangered wildlife, including butterflies. An area called Butterfly Valley in Assam, India, has become the focus of conscious _________ to protect the butterflies’ habitat (栖息地). Other projects in Serbia, Japan, and Canada are also hoping to __________. Some of these efforts are already starting to work. The population of the El Segundo Blue Butterfly in California, for instance, has increased by 8 percent since 2010.

Finding a cure for the butterfly crisis is, __________, not just for environmental groups. __________citizens can plant butterfly gardens to support and enjoy these gentle creatures. A group of female prisoners in Belfair, Washington, are helping to rescue an endangered species called Taylor’s Checkerspot. They recognize how__________ seemingly insignificant creatures can be. The world cannot afford to lose any butterflies. As environmentalist John Muir once__________, “When we try to pick out anything by itself, we find it __________ to everything else in the Universe.”