---Look at the boy running on the playground. Is it David?
---It ______ be him. I saw him go to the teachers’ office just now.
| A．mustn’t | B．can’t | C．couldn’t | D．must |
Excuse me, could you tell me ________?
A. where are they
B. how did they go there
C. when they will come back
In order to keep our students safe, strangers ________before entering the school yard.
A. will check B. will be checked C. checked
—It’s cold today. You’d better ________ your sweater.
—OK, I will.
A. put on B. turn on C. get on
Lily, can you speak more loudly? I can ________hear you.
A. almost B. hardly C. nearly
—Peter, I haven’t seen you for a long time.
—Oh, I _______ a book these days.
A. am writingB. have writtenC. wrote