The collapse of the World Trade Centre has put US economy in a difficult ___________.
| A．occasion | B．case | C．situation | D．background |
The Dragon Tower，from ________ top visitors can enjoy a good ________ of Harbin，attracts hundreds of tourists every day.
| A．which；sight | B．whose；view | C．its；view | D．where；sight |
He promised me if we_______ the game, he ________us a round of drink.
| A．win; will buy | B．would win; would buy |
| C．won; bought | D．won; would buy |
By next summer John _____in this factory for thirteen years.
| A．has been working | B．will have been working |
| C．will be working | D．has worked |
Tom sat under a tree and seeing his friend, _____ up in no time.
| A．to stand | B．standing | C．stood | D．would stand |
—When will you come to see me, Dad?
—I will go to see you when you_____ the training course.
| A．will have finished | B．will be finishing | C．are finishing | D．finish |