—Listen! There someone at the door.
—It must be your sister.
| A．is; knocking | B．is; knock |
| C．are; knocking | D．are; knock |
My little brother caught a cold, ________ he didn’t wear warm clothes yesterday.
| A．so | B．because | C．but | D．and |
— Max is really _______ honest boy.
— Yes. That’s why he is _______ most popular student in his class.
| A．an; a | B．a; the | C．an; the | D．the; / |
I look forward to _____with you again.
| A．work | B．to work | C．working | D．works |
You’ll certainly feel lonely ______ you communicate with your friends sometimes.
| A．unless | B．though | C．if | D．when |
_____ you finish your homework in time? ---- I’m afraid ______.
| A．May; mustn’t | B．Can ; not |
| C．Can; can’t | D．Must ; needn’t |