The key _________ the string was put into the door to stop the kite _________.
| A．tie to;flying away |
| B．tying to;fly away |
| C．tied to;flying away |
| D．tied to;fly away |
Before __________him, Icalled him __________.
| A．visiting；in advance |
| B．visit；in advance |
| C．visiting ； advance |
| D．visit； advance |
In the past 100 years many species, as a result of human destruction to nature，__________ and many more __________ now.
| A．have disappeared； are disappearing |
| B．disappeared；are disappearing |
| C．have disappeared；disappear |
| D．are disappearing；disappear |
Johnson held a party，__________ he invited all hisfriends.
| A．for whom | B．to whom | C．to which | D．from which |
—Where did you get to know her?
—It was on the farm __________ we worked.
| A．that | B．there | C．which | D．where |
Some pre-school children go to a day care center，__________ they learn simple games and songs.
| A．then | B．there | C．while | D．where |