I remembered________ the door before I left the office but forgot to turn off the lights.
| A．locking | B．having locked | C．to have locked | D．to lock |
It was a time_______ the killer whales helped the whalers catch the baleen whales.
| A．when | B．that | C．then | D．which |
The most important thing about cotton in history is ______part that it played in _______Industrial Revolution.
| A．∕；∕ | B．the；∕ | C．the; the | D．a; the |
We were when we heard of the news that the plane was crashed in the storm.
| A．shocking | B．shocked | C．worried | D．worrying |
After the new technology was brought in, the factory producedcars in
1999 as the year before.
| A．as twice many | B．as many twice | C．twice as many | D．twice many as |
All the students handwriting is very beautiful are going to the contest.
| A．who’s | B．whom | C．whose | D．who |