It suddenly ______ to me that we could use a computer to do the job.
| A．took place | B．occurred | C．came about | D．happened |
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 |