When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
| A．venture | B．mission | C．commission | D．responsibility |
How long ______ teaching? Forty years.
| A．he will have been | B．will have he been |
| C．will have been he | D．will he have been |
An operation is usually performed by a ______.
| A．doctor | B．dentist | C．surgeon | D．scientist |
He is the manager of the factory. He is ______ it.
| A．charged with | B．in charge of | C．charged | D．in the charge of |
The whole hall wants ______.
| A．to be cleaning | B．to be cleaned |
| C．being cleaned | D．to clean |
______ worried her mother a lot.
| A．Kate’s left home alone | B．Kate left home alone |
| C．Kate leaving home alone | D．Kate’s leaving home alone |