题目内容：

根据句意，用所给词的适当形式填空

1.Max tells funny jokes and often makes his classmates       ( laugh )

2.The zookeeper told us ___________ any noise in the zoo. (not make)

3.We hope you can accept our           and join us . ( invite )

4.All of us should do something _________ the lovely giant pandas. (protect)

5.I heard your daughter _________ in the next room at ten last night.(sing)