At present, computer knowledge has become ___________ requirement as the ability to read and write.
| A．so basic a | B．so a basic | C．as basic a | D．as a basic |
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 |
_____ with terror, the dog hid himself in a small cave, _____ his tail to the rain.
| A．Trembling; exposed | B．Trembled; exposed |
| C．Tremble; exposed | D．Trembling; exposing |