---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
| A．can’t | B．mustn’t |
| C．couldn’t | D．may not |
My mother is heavier than my aunt.
A. little B. moreC. a little
I like making friends, I am a little quiet.
A. but B. although C. so
Li Lei is as at running as me.
A. better B. well C. good
The boy is than the other boys in our class.
A. taller B. the tallest C. tall
—Could you come to my birthday party?
—Sorry, I ________.
A. couldn’t B. can’t C. can