Make sure that your computer room is 100%________of insects because they can really cause trouble to your machine.
| A．absent | B．rare | C．free | D．short |
When first seeing Masaccio’s paintings, people were convinced they were looking through _____ hole in _____ wall at _____ real scene.
| A．the; a; the | B．a; a; a |
| C．a; the; the | D．a; the; a |
It was in this house ________ the villagers held the secret meeting.
| A．where | B．in which |
| C．that | D．when |
The little boy won’t go to sleep ________ his mother tells him a bedtime story.
| A．or | B．but | C．whether | D．unless |
He’s posted the letter, _________ he?
| A．isn’t | B．doesn’t |
| C．hasn’t | D．wasn’t |
________ yourself at the end of the meeting if you have different opinions.
| A．To express | B．Expressing |
| C．Express | D．Expressed |