单项选择（每题1分）
—I can’t find my MP4 anywhere．
—_____ it be in your handbag?
| A．May | B．Must | C．Can | D．Should |
He commanded that all the gates _____when it was getting dark in case thieves came in .
| A．were shut | B．must be shut | C．could be shut | D．be shut |
Mr. Black has been teaching English in a middle school _____ he came to China.
| A．for ever | B．ever since | C．ever before | D．long before |
. — What's that noise?
—Oh , I forgot to tell you. The new machine ________
| A．was tested | B．will be tested |
| C．has been tested | D．is being tested |
—Sorry. I didn’t break the plate______.
—It’s OK. Don’t worry about it.
| A．on purpose | B．no longer | C．at present | D．as usual |
_____ your classmates and you will make more good friends.
| A．Worry about | B．Fall in love with |
| C．Think about | D．Get along well with |