What are these?
----- ___________________. 
A. These are a pair of shoes. B.These are shorts.
Your ruler is 10 _______.
A.mm B. cm C. M
I’mthan you.
A. strong B. tall C. stronger
Mike is 13 years old. I’m 12 years old. So I’m ____than him.
A. heavier B. thinner C. younger
Yesterday Liu Yun____ a mountain with her parents.
A．climbed B. climb C. climbing
Amy is a teacher, she _____ English.
A. teach B. teaches C. teacher