It was not until 3 days later that the boy came back to life and explained to the police what_______ to him.
| A．was happening | B．was to happen | C．had happened | D．has happened |
I’ve heard that the wood tower was built more than 1,000 years ago, so I think it is worthy ________．
| A．visiting | B．to visit | C．being visited | D．to be visited |
Attracting senior citizens, Florida ishome to the largest population of elder Americans．
| A．/; / | B．the; the | C．the; / | D．/ ; a |
--- -When did he get his first novel published?
---- It was in 2008 ____ he was still in high school.
| A．that | B．since | C．when | D．w hich |
Nobody can explain the mystery ____ he suddenly disappeared.
| A．why | B．what | C．whether | D．which |
It suddenly___ to me that we could use the computer to do the job.
| A．stroke | B．occurred | C．happened | D．saw |