The first thing I’m going to do is to send an e-mail to Peter.
That's very kind ______ you. I know it's very hard _______ you to do that.
David used to _____________ in the afternoon.
How do you study _______a test? I study _______working with friends.
--- Could you tell me ? --- Certainly. In 20 minutes.
---How much did the new watch your sister?---She 350 yuan for it.