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
Time ________ heal a broken heart. After five years, Steve seems to have got over the sorrow of losing his son.
A．should B．would
C．shall D．can
—David is often absent from class.
—Tell him he ________ answer for it if he goes on behaving like that.
A．shall B．might
C．would D．can
