1 . 海豚用声音相互沟通。
Dolphins use sound to ____________ ____________ each other.

2 . Yesterday the boy was very upset, but finally his mother managed to c__________ him down.

3 . We shall be very happy __________________________________________.
我们将很高兴在这个项目上与你合作。(根据汉语提示完成句子)

4 . In my opinion, it is much easier for a child to________ ________(适应) a new environment than an adult.（根据汉语提示完成句子）

5 . She caught a cold and it took her three days to _______(痊愈，恢复) （根据汉语意思填空）

6 . 我不愿像大多数人那样在日记中记流水帐。
I don’t want to_____________ in a diary as most people do.

7 . My old car was out of work. I decided to r________ my old car with new one. （根据首字母单词拼写）