3 . The part of the environmental movement that draws my firm’s attention is the design of buildings. Today, thousands of people come to ________ building conferences, and the idea that buildings can be good for people and the environment will be increasingly ________ in years to come. Back in 1984 we discovered that most manufactured products for decoration weren’t designed for ________ use. The “energy-efficient” sealed commercial buildings constructed after the 1970s energy crisis ________ indoor air quality problems caused by materials such as paint, wall covering and carpet. So for 20 years, we’ve been looking for ways to make these materials ________   for people and the planet.

Home builders can now use materials, such as green paints, that release significantly ________   amounts of chemical compounds, which people believe don’t ________ the quality of the air.   ________, our basic design strategy is focused not simply on being “less bad” but on creating ________ healthful materials that can be either safely returned to the soil or ________ by industry again and again. For example, the world’s largest carpet manufacturer has already ________ a carpet that is fully and safely recyclable.

Look at it this way: no one ________ to create a building that destroy the planet. But our current industrial systems are basically causing these conditions, whether we like it or not. So   ________ of simply trying to reduce the damage, we are ________ a positive approach. We’re giving people high-quality, healthful products and an opportunity to make choices that have a ________   effect on the world. It is not just the building industry, either. Entire cities are taking these environmentally positive approaches to design, planning and building.

4 . What I love most about traveling isn’t seeing the famous landmarks or eating great food. It’s watching my mom gasp (倒抽气) at something ______and unexpected. In Yellowknife, it was the bright aurora (极光). In Japan, it was 3,000 cherry trees. To get to them, we had to travel great distances (距离) and______our trips just right. All of them were better because we saw them_______.

When I tell people how much I like to______with my mom they often feel_______.We expect parents to show their children the______. When children become older, things are______. They prefer traveling with friends. They no longer have to see the world through their______.

When I was little, my mother was my_______. She is responsible (负责的) for everything that makes me a good person. She’s kind and patient but she has little time to_______. So at 23, I booked two tickets to Yellowknife. We would explore the world as friends; I could______my mother to see the world on her own terms.

Our trips are not without______times. We’ve gotten on the wrong train, encountered (遭遇) wild animals, and even lost our passports. But I have never______any of the trips with my mother. Before our ______, I had no idea how much my mom loved the mountains. Most of all, I never knew how much I could______her as a friend.

5 . The bell rang. Jacob smiled and he was glad his math class was _______. He grabbed his lunch bag out of his backpack and looked inside. He blinked. Beside his usual lunch, there was an envelope. Jacob opened it and slid out a (n) _______. It was of a suitcase. Jacob _______ what it meant.

The next day at lunchtime Jacob opened his bag. A new envelope peeked out. Inside was a tiny toy _______. Now he was _______! When he got home, he asked his mother, “Are we taking a plane somewhere?” She just _______ at him, her eyes sparkling. “I guess it’s a mystery(谜)” was the only _______ she gave him.

Over the next few days, Jacob _______ more: a small American flag, a leaf from a palm tree and _______ a juicy orange. Then one day, when he finally got to open his lunch bag, there was ________ in it except for his usual lunch. His heart sank. Maybe he had been wrong after all. Maybe there was no trip. He was very ________.

Just before the end of the day, the school secretary handed Jacob a small box. “This is for you and ________ your mother outside.” He opened the box. A smile slid across his face. He ________ and pulled out a small black hat with two round mouse ears.

He hurried down to the main school doors where his mother and father were waiting, with suitcases. “We’re going to Disney World, right?” Jacob couldn’t contain his excitement. “Mystery ________,” laughed his mother. “Come on, we’re headed to the ________!”

6 . Many of us develop a desire to travel. ________, few are lucky enough to turn that desire into a ________ career. For Trish Sare, owner of Vancouver-based Bike Hike Adventures Inc., it was a ________ story.

“I left home when I was 20 with a ________ of traveling the world for five years,” recalls Sare. “During that period, I spent a lot of time meeting adventure companies abroad and taking part in some of their adventures. Upon returning, I studied ________ and fitness leadership. Then, when we had to do our field placement (实习), I ________ a tour agency. When they heard about my experience, they asked if I wanted to go to Costa Rica for my placement and ________ as a tour leader. And that is where it all began.”

That beginning marked the accomplishment of a ________ dream for Sare. Today, she can ________ those exciting memories from such places as Thailand, Nepal, Costa Rica and more. Although Sare followed her dream of traveling for many years, she began ________ something that offered just a little bit more. So, in 2014, she took the big ________ of starting her own company: Bike Hike Adventures Inc.

Her career has ________ her all over the world to interact with people of so many different cultures and backgrounds. Looking back, Sare can ________ say that it’s been the right choice for her. Here’s her ________ for those wanting a similar path: “Do some traveling ________ your own first and then you’ll be marketable to companies,” she concludes.

8 . Like many young people, Jessica wants to travel the globe. Unlike most of them, this 25-year-old is doing it _______ . She and her husband have spent the last two years traveling the world, stopping everywhere from Paris to Singapore. It might sound like one long, expensive _______ , but the couple has an unusual way to make their travel _______ .

They’re part of a new form of the _______ economy: an online group of house sitters. Throughout their no-cost stays in _______ homes, they feed pets and water plants in the homeowner’s _______ .

It’s not all sightseeing. The two travelers carefully _______ their trips, scheduling their days around the pets that are sometimes difficult to _______ . But house sitting also offers a level of _______ they can’t find in a hotel. “It’s like ________ at a friend’s house,” Jessica says.

The couple has a high ________ rate in getting accepted as house sitters and they always go beyond the homeowner’s ________ . For Jessica, that means ________ plenty of pictures of happy pets, keeping the house ________ and leaving a nice small gift before heading to the next house. “You want to make the homeowner feel that they made the right ________ ,” she says.

10 . It is the first day of the summer. George and his friend Carlos are ________ for a camping trip. It is going to be the best camping trip, which will last three days. While Carlos makes ________ for their friends, George is going to make a list of activities to do while they are there. Last year, their camping trip was not entirely a ________. They got a flat tire on the way to their campsite. They also found a ________ bear seizing some of their food. They don’t want to ________ that chaos again.

This year, they want to make a ________ plan. George is going to take a ________ tire and gas, just in case they run out. Carlos is going to try and find a better ________ of storing food without attracting ________ to their campsite. They don’t want anything to ruin this year’s ________. On this trip, George and Carlos have invited ten of their friends. Everyone is ________. George has prepared his list of ________ to do with his friends.

Mountain climbing, hiking, fishing, and to play a few games of flag football are all on their ________ . For night activities, they plan to tell stories, sing songs along with George’s guitar, and play some board games. With the list Carlos ________,they are going to have vegetables, chicken, fruit and some ________ for sudden illnesses. It is going to be the best trip they have ever made.