—How long can I _______ the book ?— Two months.
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.
---Would you like me to help you with the homework? ---______________ . But I can manage it myself.