1 . It is no use __________(talk) with a person like him.

2 . __________ is a chemical change. (burn)

3 . On ____________ (see) her mother, she burst into tears.

4 . The debate came to a               (conclude) soon after midnight.

5 . He avoided __________ (punish) by his boss by making an apology.

6 . ________(understand) your own needs and styles of communication is as important as learning to convey your affection and emotions（所给词的适当形式填空）

7 . It's worth ____________ that there are plenty of ways to put your skills to use in combating climate change. (clarify) (所给词的适当形式填空)

8 . After six hours’ climbing, we succeeded in_________(get)to the top of the mountain. （所给词的适当形式填空）

9 . It is no good completely ________ (ban) students________ surfing the Internet. (所给词的适当形式填空)

10 . ________ (learn) to think critically is an important skill today’s children will need for the future. (所给词的适当形式填空)