1 . Don’t _____________(松开) the rope or I will fall into the river. (根据汉语提示完成句子)

2 . Don’t ________ (hesitation) to call me if you need any help. （所给词的适当形式填空）

3 . Do not u_______ (从事) exercise for a few hours after a meal to allow food to digest.

4 . 不要让婴儿暴露在强烈的阳光下。这对他们的皮肤有害。
Do not   ___________ babies   ___________   strong sunlight. It's harmful to their skin.

5 . 不要在动物身上试验这种药。
Don't ___________ the drug ___________ on animals.

6 . Do not u_______ (从事) exercise for a few hours after a meal to allow food to digest. (根据中英文提示单词拼写)

7 . ____ you believe him when he said he made it to Eason’s concert! He doesn’t like pop music at all.

A．Do

B．Did

C．Don’t

D．Didn’t