Ladies and gentlemen, please fasten your seat belts. The plane __________.
| A．takes off | B．is taking off |
| C．has taken off | D．took off |
______with several kinds of flowers and plants, our school looks much more beautiful．
| A．To be planted | B．Planting | C．Having planted | D．Planted |
Merry________ as a secretary in the company for five years, but now she is a general manager of the company．
| A．worked | B．has worked | C．is working | D．works |
Putting waste in different bins made it easier for it______．
| A．to recycle | B．recycles | C．recycling | D．to be recycled |
He said he would arrive before seven, and______ ．
| A．he did | B．did he | C．he had | D．had he |
A big dust storm covered Sydney for hours, ______ the Sydney Opera House invisible．
| A．made | B．making |
| C．make | D．to make |