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

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

A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.

A．may have been  B．must be

C．need have been  D．might be

There was something wrong with the network, or the e­mail ________ earlier.

A．could have been sent  B．might be sent

C．need have been sent  D．must be sent

—________ you leave now? You only arrived an hour ago!

—Sorry, but so much homework is waiting for me.

A．Must  B．May

C．Can  D．Might