给下列问句选择相应的答句。① What are you doing? {#blank#}1{#/blank#} A. No，she isn't.
② What is your mum doing? {#blank#}2{#/blank#} B. Yes I am.
③ Can I use your pen? {#blank#}3{#/blank#} C. I'm cleaning my room.
④ Is Sarah reading a book? {#blank#}4{#/blank#} D. She is cooking fish.
⑤ Are yoy doing homework? {#blank#}5{#/blank#} E. Sure.
