给下列问句选择相应的答语。① What are they doing? {#blank#}1{#/blank#} A. She's sitting under a tree.
② Do you see a cat?{#blank#}2{#/blank#} B. He is cleaning his room.
③ What's Mike doing? {#blank#}3{#/blank#} C. Yes, I do.
④ Where is Amy?{#blank#}4{#/blank#} D. They are watching TV.