—我们在洗车。

—What {#blank#}1{#/blank#} you {#blank#}2{#/blank#}?

—{#blank#}3{#/blank#} {#blank#}4{#/blank#} the car.

It is on {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.

{#blank#}1{#/blank#}18只奶牛                  A. It's thirteen.

{#blank#}2{#/blank#}爷爷和奶奶                  B. Dear YangMing

{#blank#}3{#/blank#}等于13                     C. twenty horses

{#blank#}4{#/blank#}20匹马                     D. grandpa and grandma

{#blank#}5{#/blank#}亲爱的杨明                   E. eighteen cows

Let's {#blank#}1{#/blank#} {#blank#}2{#/blank#} on Sunday.