Spending so much time playing computer games is holding him ________at school.
| A．on |
| B．off |
| C．back |
| D．over |
Had they not returned for their possessions, they would have survived the earthquake and _____ alive now.
| A．would be | B．are |
| C．were | D．would have been |
We have no idea _____ he will come to attend the meeting tomorrow.
| A．which | B．when | C．whether | D．what |
Keep struggling and in no case _____ to give up trying.
| A．you are supposed | B．are you supposed |
| C．are supposed you | D．supposed are you |
— Hello, may I speak to Mr. Black?
—Sorry. You _____ the wrong number. We don’t have a Mr. Black here.
| A．could dial | B．must have dialed |
| C．would dial | D．should have dialed |
It is said that most wild animals will not attack people _____ they are cornered.
| A．while | B．since | C．unless | D．once |