The students were ____ over the ____ problem, listening to the teacher with a ____
expression on their faces.
| A．puzzled; puzzling; puzzling | B．puzzled; puzzling; puzzled |
| C．puzzling; puzzling; puzzled | D．puzzling; puzzled; puzzling |
—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 |
—Jim is very sick these days. He coughs so badly.
—In my opinion, he really ________ listen to the doctor and cut down on smoking.
| A．should | B．can |
| C．may | D．need |