找出下列问句相应的答语。①What do you do on the weekend? {#blank#}1{#/blank#} A. I'm playing ping-pong with Amy.
②What are you doing? {#blank#}2{#/blank#} B. Sometimes he reads books.
③When do you go to bed? {#blank#}3{#/blank#} C. I usually wash my clothes.
④What does Tom do on the weekend? {#blank#}4{#/blank#} D. At 9 o' clock.