30. With little knowledge about the area he succeeded ______ many researchers failed.
| A．the place where | B．in place | C．while | D．Where |
---Where were you when I called at your house this morning?
---Oh, I_____ for a friend from Tokyo at the airport．
| A．had waited | B．am waiting | C．have waited | D．was waiting |
Plastic bags are provided for our convenience but they have also_______ the pollution of the environment．
| A．adapted to | B．turned to | C．contributed to | D．looked forwarded to |
Tom sounds very much in the job, but I’m not sure whether he can manage it．
| A．interested | B．interesting | C．interestingly | D．interestedly |
I along the street looking for a place to park when the accident________．
| A．went; was occurring | B．went; occurred |
| C．was going; occurred | D．was going; had occurred |
That was really a splendid evening．It’s y
ears ______ I enjoyed myself so much．
| A．when | B．that | C．before | D．since |