How many________？
A．cat B．cats
( ) Let’s go________home.
A. toB. his C. /
( ) The________coats are over there.
A. twins B. twin’sC. twins’
( ) Those are________.
A. apple treeB. apple trees C.apples trees
( ) The books are on the desk. Can you see________？
A. it B. they C. them
( ) The twins________new students________our class.
A. are; inB. is; in C. are; at