填空题。根据句意用所给动词的适当形式填空（每小题1分，共5分）
My mother enjoys _________(dance) very much.
It takes me 2 hours           (do) my homework every day.
Listen! Who        (play) the piano in the classroom?.
Some dogs just don't know how            (have) fun.
We plan ______(go) swimming this weekend.