题目内容：

根据句意，用括号中所给词的适当形式填空。

1.—How old is your son?

—We had a special party for his       birthday last Saturday. (nine)

2.The dictionary is very       to us students.(help)

3.Parents always tell their children not to accept any food from a       .(strange)

4.Don’t be angry with       . He is just a child.(he)

5.You should give up       because it isn’t good for your health.(smoke)