It was so nice of you to come to our aid. I don’t think we ______ it without you.
| A．can manage | B．could have managed | C．must have managed | D．could manage |
—Will you go to Mary’s wedding party tonight?
—I’m afraid not. I _______ my brother’s.
| A．will attend | B．have attended |
| C．am attending | D．will be attending |
Lacking _______ evidence, the police couldn’t arrest the man.
| A．ordinary | B．potential |
| C．solid | D．common |
A kind passenger paid for my ticket, without which I _______ the last train.
| A．couldn’t catch | B．couldn’t have caught |
| C．didn’t catch | D．hadn’t caught |
—I have done well in the exam because of no careless mistakes.
—Congratulations! Students can never be _______ careful in exams.
| A．so | B．very | C．too | D．enough |
With so many good friends together with you, you must have been happy during the past National Golden Week, _____?
| A．haven’t you | B．didn't you |
| C．weren’t you | D．mustn’t you |