—_____ that he picked up his uncle at the airport?
—It was at 6:00 in the afternoon _____ he got off work.
| A．Was it when; that | B．When was it; that | C．Was it when; when | D．When was it; when |
It was reported that a chemical factory________ last night, which killed thirty workers.
| A．exploded | B．cracked |
| C．ruined | D．burst |
The exhibition is well worth ________ and you can see fancy vases of different dynasties on show there.
| A．to visit | B．to be visited |
| C．being visited | D．visiting |
Only when he reached the tea-house _________ it was the same place he’d been in last year.
| A．he realized | B．he did realize |
| C．realized he | D．did he realize |
She’s having a lot of trouble with the new computer, but she doesn’t know whom to _______.
| A．turn to | B．look for |
| C．deal with | D．talk about |
The time he has devoted ______ the disabled is now considered ________ of great value.
| A．to help; being | B．to helping; to be |
| C．to help; to be | D．helping; being |