大明想知道 Sam来自哪里时.应该怎么说____A.what are you doing .Sam? B.where are you from.Sam?C.what are you going to do.Sam?
They are playing __________ piano.
Is Kate cleaning the door?A.Yes, she is. B.Yes, she does. B.C.No, she don’t. D.No, she doesn’t.
Lucy _______ making a cake.
What do ________ have?
How many __________ are there in the basket?