题目内容：

选词填空，注意使用适当形式。

teach, knife, pronounce nine, they

1. Dear, we need three more __________.

2.The children are not old enough to take care of ___________.

3. We’re in the __________ grade now. And we should learn hard.

4.We should pay attention to our __________.

5.Dad, who __________ you English when you were young.