— Would you please tell me _________? — In half an hour. A. when the plane left B. when the plane will leave C. when will the plane leave
—He plays basketball so well! Who taught _______? —He learnt it by _______.
—_______ can I keep the books? —Two weeks.
My mother often tells me _______ my classmates when they need.
Do you prefer _______?
You should _______ the doctor’s advice and _______ the medicine on time.