Water comes from the s{#blank#}1{#/blank#}, the rain and the t{#blank#}2{#/blank#}. How do we use water? We u{#blank#}3{#/blank#}water to w{#blank#}4{#/blank#}our hands, wash vegetables and c{#blank#}5{#/blank#}. F{#blank#}6{#/blank#}use water to grow crops. Fireman use water to p{#blank#}7{#/blank#}out fires. Water is very u{#blank#}8{#/blank#} .we must save water.

—Hello, Jenny. I'm doing my homework. The sums are very {#blank#}1{#/blank#}.

—Let me see. The sums are easy. Let me help you.

A：Do the boys like {#blank#}1{#/blank#}?

B：Yes, they do.