Miss Li ________ as a biology teacher for fifteen years in our school, and now she is Party secretary of our city.
| A．has worked | B．worked | C．had worked | D．works |
____________ people in the world are sending information by E-mail every day.
| A．Several million | B．Many millions | C．Several millions | D．Many million |
The discussion_______________alive when an interesting topic was brought in.
| A． was coming | B．had come | C． has come | D． came |
My mind wasn’t on what he was saying so I’m afraid I________________half of it.
| A． was missing | B． had missed | C． will miss | D． missed |
All the preparations for the task ___________, and we’re ready to start.
| A． completed | B．complete |
| C．had been completed | D．have been completed |
Visitors ________not to touch the exhibits.
| A． will request | B．are requested | C．are requesting | D．request |