给下列句子选择恰当的答句。⑴Please don't sleep in class. {#blank#}1{#/blank#} A. It's on the chair.
⑵Where is my schoolbag? {#blank#}2{#/blank#} B. I'm sorry.
⑶Is that your pencil? {#blank#}3{#/blank#} C. No, it isn't.
⑷Open the door, please. {#blank#}4{#/blank#} D. It's a pen.
⑸What's this? {#blank#}5{#/blank#} E. Yes, Mr Green.