The world ______. Things never stay the same.
| A．changes | B．is changing | C．was changing | D．will change |
You'd better not ring me up between 9:00 and 10:00 tomorrow. I __________ an important meeting then.
| A．have |
| B．had |
| C．was having |
| D．will be having |
I __________ up to $5，000 by the time the new term begins in September.
| A．have saved |
| B．will have saved |
| C．will be saving |
| D．had saved |
-We'll go to the party to be held in the Grand Theater at 8： 00tonight. Could you join us?
-I'm afraid I can't. I __________ the paper with my instructor.
| A．am discussing |
| B．have discussed |
| C．will be discussing |
| D．will have discussed |
-Can I come to see you at ten o'clock, John?
-I'm sorry, Jo, but I __________ my uncle then.
| A．visited |
| B．will visit |
| C．will be visiting |
| D．am visiting |
-The train will arrive at the station in half an hour. Who __________ for us?
-I am sure Dad will be standing there when we get off the train.
| A．will be waiting |
| B．was to wait |
| C．wait |
| D．was about to wait |