Tell John not to leave the house unless he _______that the lights ______ .
| A．will make sure, turn off | B．makes sure; are turned off |
| C．will make sure; will turn off | D．makes sure; will be turned off |
—Car prices have been going down sharply in the last 20 years.
—It's not surprising because the law of market ________ the price of a product.
| A．is controlling | B．controls |
| C．has controlled | D．controlled |
—We'll go to the party to be held in Qinghai Grand Theater at 8 tonight. Could you join us?
—I'm afraid I can't. I ________ the holiday plan with my friends.
| A．am discussing | B．have discussed |
| C．will be discussing | D．will have discussed |
Mother reminds, “________ rain, take an umbrella.” as spring approaches.
| A．Shall it | B．It shall |
| C．Should it | D．It should |
—Jenny took the 8： 00 bus to Guangzhou this morning.
—Really? She ________ the 9：00 train. It's much more comfortable and safer to travel by train.
| A．could have taken | B．should take |
| C．must have taken | D．can take |
—You will never believe that it took us two hours to get to the restaurant.
—Really? You ________ in a traffic jam.
| A．needn't have got stuck | B．couldn't have got stuck |
| C．must have got stuck | D．should have got stuck |