题目内容
Try ________ at the back door if nobody ________ at the front door．
- A.knocking, hears
- B.to knock, hear
- C.knock, hear
- D.knock, hearing
try doing sth．意为“尝试做某事”，nobody是不定代词，作主语时，谓语动词用第三人称单数形式。
考前必练系列答案| 请认真阅读下面的短文，然后完成信息卡。 | |||||||||||
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Last week, I went to the countryside to visit my grandmother with my sister. My grandmother is 80 years
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| Nowadays problems with the earth are getting more and more serious. For example, pollution is making the environment not anymore suitable for us to live in. Also, energy is running out. However, there is still something everyone can do in our daily lives to help save our planet. First of all, we should turn off the lights when leaving a room. It's really easy to do. Also, we're supposed to turn off the shower while washing our hair. And are you still using paper napkins? You'd better stop now because paper is made from wood. If everyone uses paper napkins, a lot of trees will have to be cut down every day. Maybe it is hard to stop using paper napkins, but we must try. At the same time, we should think of good ways to recycle paper. Another thing is that we must try to take our own bags when shopping instead of using plastic bags that are provided by the supermarkets. Finally, we must stop driving cars because cars pollute the air. Instead, we'd better ride bicycles. For one thing, it's good for our health. For another, it's much cleaner. I really hope that more and more people will realize the problem and do what they can to help make our world a better place to live in. | ||||||||||
According to Tom's article, fill in the blanks.
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