—How was your trip to Yancheng last week?
—Wonderful! I only felt sorry that I ________ the nature reserve of redcrowned cranes, but the weather was awful.
A．could visit B．could have visited
C．might visit D．might have visited
If I ________ your advice then, I think that the crops could be growing better.
A．took B．would have taken
C．had taken D．have taken
If you ________ home without a word, your parents wouldn't be so worried now.
A．didn't leave B．couldn't have left
C．hadn't left D．shouldn't leave
We ________ here on time but we were caught in a traffic jam.
A．must have arrived B．could have arrived
C．need have arrived D．should have arrived
—Can you keep a secret?
—You ________ worry—I'm not going to mention it to anyone.
A．needn't B．couldn't
C．mustn't D．won't
For those of you who ________ a few very popular articles that came out last week, check out this mail.
A．may miss B．must have missed
C．may have missed D．would have missed
