用所给词的适当形式填空

①There's nothing in the fridge. Why not (go) shopping now?

② Jane practises (play) the piano on Sunday.  

③ It's a good idea (watch) films in English twice a month.

④ In order to improve your English, you should try (speak) English every day.

⑤ David's teacher often gives him some (advice) on study.