—Mr. Smith, why are you always asking me to do the difficult work?—Because you _______ do such a thing and nobody else is fit for it.

—Did Ann fail in English?—She ________. Don't you notice that she looks depressed?

I want to open the door, but it _____ open.

---Lucy doesn’t mind lending you her dictionary.---I think she doesn’t, but I ________do so. I’ve already borrowed one.

Could you please_____ the piano so loudly? Your brother is having a rest now.