( ) (3) 当你想问别人这是什么的时候, 应说:A. What are you doing ? B. What are you work ? C. What is this?
These are ______. You can buy a pair for your mother.
I can see ______ in Lucy's room.
-- _______ are his football clothes? -- Under the bed.
I have two good pen friends. One is an American, ______ is in England.
There are so many people in the shop. You must ________ your things.