用括号内所给单词的适当形式填空。（5分，每空1分。）
小题1:If you have a ____________ (tooth), you should go to see a dentist.
小题2:My sister can look after_________ (she).
小题3:They wanted _________ (visit) the West Lake last week.
小题4:Don’t go out. It’s raining ___________ (heavy).
小题5:There are a lot of after-school ____________________ (activity) in our school.