1 . 对于我们来说，学会如何与别人相处是必要的。
_________________________________________________

2 . 对学生们来说不熬夜是多么有必要啊！
How ________________!

3 . It s important to learn to g________ (猜测) the meanings of new words.

4 . —It is very important for all of us ________ safe.
—I agree. We students should learn to protect ourselves in daily life.

A．kept

B．keeping

C．to keep

D．keep

5 . It’s difficult for Tom ________ (catch) the ball.

6 . It usually takes me one hour _________ (finish) my homework every day.

7 . 关注青少年的心理健康很有必要。
It’s necessary to ________________ teenagers’ mental health.

8 . It takes me about two hours _________ (do) some shopping.

9 . It’s really wise of you ________ (join) the club. You have so many friends now.

10 . It’s hard for scientists __________ (explain) where the big rocks come from.