题目内容

It's our duty ________ our classroom tidy.

[　　]

A．to keep

B．keep

C．kept

D．keeping

答案：A
解析：

it作形式主语，动词不定式短语作真正的主语。


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相关题目

在下列各句的空格内填上一个适当的完整的单词，该词的首字母已给出。

1.As the first Chinese woman astronaut, Liu Yang l　   on the moon in June successfully.

2.Ninety d　    by three is thirty.

3.Tom spoke so q　   that I couldn’t follow him.

4.The horse could not raise i　   from the ground after a long run.

5.It’s our d　   to look after our parents when they get older.

 
根据下列句子及所给单词的首字母，写出各单词的完全形式。
1. Take two of the pills three times d______ before meals.
2. The d______ of a friend is always sad.
3. I think he will work out the problem, because he is quite a p______ person.
4. Food and water are n______ to man. We can't live without them.
5. If you want to get a good result in the exam, you must pay a______ to what your teacher says in class.
6. It's our d______ to clean up the city parks so that our city looks more beautiful.
7. Marie and I are good friends and we think our f______ will last forever.
8. My bike was l______. I have to buy a new one.
9. By the end of last t______, we had learned more than 2,000 words.
10. I won't go to the party u______ I am invited.
根据句意首写字母填单词。
1. It's a ________ (秘密) between you and us. Don't tell anybody about it.
2. As students, it's our d________ to study hard at any subjects.
3. My grandfather died last month. His d________ made me very sad.
4. Bruce is old enough to look after h________ (他自己).
5. I don't know the right p________ of the word Jane
6. You should try your best if you want to ________ (实现) your dream.
7. If I had 5 million dollars, I would give it to medical ________ (研究).
8. Our teacher often tells us the ________ (重要性) of learning English.

根据句意及首字母提示完成单词

1．A: How do you study for a test?

B: By making v               lists．

2．Don't laugh at the people when they are in t        ．We should help them．

3．There are many books on the these s           in our school library．

4．New Year's coming．I'm trying to get good grades in the f          expires．

5．She has a problem and she wants to know how to s            it．

6．As a student, it's our d             to study hard at school．

7．He is afraid of flying．He feels a         before he gets on the plane．

8．I hope you can a          your dreams because you are always working hard．

单词拼写

96.You are under 18 years old. You can’t drive a car if you don’t get a l____（执照）.

97. We should r_________(将…视为) problems as challenges in our studies.

98. It’s s_____(傻的) of teenagers to wear earrings.

99. In the end , he r_____(认识到) the importance of learning English well.

100.It’s our d_____(责任) to try our best to keep the classroom clean and tidy.

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