The lecture, ____ at 7:00 pm last night, was followed by an observation of the moon with telescopes.
| A．starting | B．being started | C．to start | D．to be started |
Jack doesn’t smoke now, but he ______ for almost twenty years.
| A．smoked | B．was smoking | C．has smoked | D．had smoked |
Please remain _________ until the plane has come to a complete stop.
| A．to seat | B．to be seated | C．seating | D．seated |
I don’t think television will ever ______ books.
| A．take place | B．take the place of | C．take their place | D．take place of |
There were no tickets _________ for Friday’s performance so we went to the cinema instead.
| A．available | B．valuable | C．expensive | D．enthusiastic |
.________ the sunlight for a long time is harmful to your skin.
| A．Exposed to | B．To expose in | C．Exposing in | D．Being exposed to |