A. at B. in

C. of D. on

A. to mop up it B. to mop it up

C. mop it up D. mop up it

A. am B. is

C. are D. be

— It’s very cold.

A. What , like B. What’s , like

C. How’s , like D. How . /

A. an, An B. an, A

C. an, The D. a, The

【题目】He's never rude. I think he's one of the most _______ boys in his class.
A.polite
B.healthy
C.beautiful
D.strong

A．read；read

B．reading；read

C．read；reading

D．reading；reading

— It’s yellow.

A. What B. Who

C. What color D. How