如果有人对你说:“I’m sorry.”你应该怎么回答: A.Thank you.B.You’re welcome.C.It’s OK.
What are they ____? A.matter. B. doing. C. look.
She is ____. A. this B. what. C.talking.
We ___ a happy family. A. a B. is C.are
My mother ___ a doctor . A.am B. is C. are
You ___ a girl. A.am B. is C. are