Our school has about 100 computers, but only sixty percent ____ used regularly.
| A．is | B．are | C．was | D．were |
The drill in Antarctica dragged on slowly because of lack of money, equipment breakdowns, environmental _____ and severe cold.
| A．concerns |
| B．assumption |
| C．occupations |
| D．ignorance |
Can you show me a case this phrase is often misused by Chinese students, Mr. Brown?
| A．when | B．that | C．where | D．what |
—What on earth makes you apply for the position as a guide?
—This is the job that I .
| A．looked for | B．had looked for |
| C．will look for | D．have been looking for |
The students entered the classroom，smiling and________，and ______ down to have their lessons.
| A．talked；sat | B．talking；sitting |
| C．talking；sat | D．talked；sitting |
He kept a little notebook, in which the names and addresses of his friends.
| A．wrote | B．was writing |
| C．were written | D．was written |