—__________!

⑴They are talking in the library. {#blank#}1{#/blank#}                   A. Keep to the right.

⑵He is drawing on the desk. {#blank#}2{#/blank#}                        B. Take turns.

⑶They are drawing in the classroom. {#blank#}3{#/blank#}          C. Talk quietly.

⑷We are playing games in the park. {#blank#}4{#/blank#}           D. Work quietly.

⑸They are walking on the stairs（楼梯）. {#blank#}5{#/blank#}    E. Keep your desk clean.