上课铃响了,教师走进教室,班长应该说: A.Please come in.B.Good morning.C.Stand up.
____ are standing. A. she B.It C.They.
What ___ they playing ? A. are B. am C. is
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