Since they came to the Moon, they haven't seen a dog. That's     1     Jimmy's father brought a dog from the earth. It was at the rocket station     2     （go）through the tests. Jimmy and Robutt were playing on the crater     3     his father told him by radio to go back home. He looked     4     （thick） and stubbier with his spacesuit on, but that couldn't keep Jimmy     5     racing up the slope in a floating hop However, Robutt, a good companion for Jimmy, didn't need a spacesuit.

Hearing that his father had brought a dog but he had to give Robutt to some other boy or girl, Jimmy frowned.

Even though it     6     （programme） to act the way it did, it did everything he wanted it to do and he never regarded it as a machine. The difference between Robutt and the dog was hard     7     （explain）, but his father insisted that Jimmy     8     （keep） the dog instead of Robutt. Jimmy wouldn't change his mind and firmly held Robutt in his arms.

    9     （hold）tightly by Jimmy, the little robot-mutt, which had never been held so tightly in all its     10     （exist）, squeaked high and rapid squeaks—happy squeaks.

At the very beginning of the     1    (twenty) century, only the very rich in Britain had gardens. Today, millions of Brits like to say that they have “green fingers”, with around half the population    2     (spend) most of their free time gardening.

For many people in the UK, their garden is their own private world. While many Brits like nothing    3    (good) than cutting the grass on Sundays, some are happy just    4    (sit) and enjoy the beauty of their small world.

But space in cities is limited and new    5    (solution) need to be found. Those without outside space can rent small pieces of land to grow things. Today, over 4,000 people are waiting     6    such pieces of land in London. A new idea is to turn rooftops and walls into private gardens. These gardens have     7    (success) helped make the cities greener and improve air quality.

Gardening is good for the soul as well as for the environment. No other free time activity     8    (allow) you to be at one with nature and create more beautiful living things. If you have any doubt, take a moment to reflect    9     this line from The Secret Garden: “    10     you tend a rose...A thistle cannot grow.”

Marine biology is the study of the ocean’s plant and animal life. Marine life gives us food, medicine and other raw materials we need. It also supports tourism and provides us with an area of recreation.

    1     (difference)forms of life live in various areas of the ocean. Some are limited to coastal and shelf areas, while others live in the open sea.

Coral reefs     2     (find) in the tropical areas of the world, but they can also exist in colder water. Reefs are built by corals and other     3     (animal)that leave calcium on rocks. They are home to     4     vast variety of life forms. About half of the world’s coral reefs, however,are     5     danger because of global warming and a rise in sea temperatures.

Although we do not know very much about    6     kind of life forms exist in deep ocean trenches(深海沟), marine scientists have found a certain type of jellyfish(水母) in the Mariana Trench, the world’s     7     (deep)ocean area. These parts of the ocean     8     (usual)have little or no sunlight and many organisms(生物)here have to produce light     9     (they).

Marine scientists also study how waves and currents affect organisms     10     (live)in the oceans.

According to American news, a new study has found that the risk of     1     (die), hospitalization and serious health issues from COVID-19 increases with reinfection regardless     2     vaccination (接种疫苗).

The study examined U.S. Department of Veterans Affairs data     3     (collect) from March 1, 2020 through April 6, 2022. It     4     (include) information on 443,588 patients with one SARS-CoV-2 infection, 40,947 with two or more infections, and 5.3 million     5     were not infected. Most of the study subjects     6     (be) male.

“Reinfection with COVID-19 increases the risk of     7     acute (急性的) outcomes and long COVID,” said Dr. Ziyad Al-Aly of Washington University School of Medicine in St. Louis. He added that this was clear “in unvaccinated, vaccinated and boosted people.”

Reinfected patients had a     8     (high) risk of hospitalization and life safety compared with individuals infected only once. The patients also had increased risks for     9     number of other health problems, the study, reported in Nature Medicine, found. The problems affected the lungs, heart, blood, kidneys,     10     (bone) and muscles. Reinfection also increased the risk of mental health, brain and nerve disorders.

Internet memes(网络爆红) can broadly be considered social or cultural ideas that are widely spread on the Internet.

In 1976, biologist Richard Dawkins     1    (use) the word “meme” in his book The Selfish Gene to explain how cultural information and social memories spread from person to person.

Memes are not something new. In fact, memes can date back to the days     2    cultural ideas were spread by word of mouth such as stories and jokes. In     3    past, a cultural idea might spread from person to person through speech. Today, an Internet meme can spread much     4    (rapidly) through emails, text messages and website links.

Most Internet memes are based on things people find    5    (interest) and they attract a wide audience. Internet memes can also be related to other things, though. For example, it is possible     6    (find) Internet memes about made­up stories, social commentary, and some other     7    (subject).

Most Internet memes    8    (create) and spread by teens. They get access    9    the Internet world at a very young age and enjoy    10    (share) their experiences with others through the Internet.