I buy my mother a sweater.＝{#blank#}1{#/blank#}我给我妈妈买了件毛衣。

△sth若是代词，只能用buy sth for sb. 如：{#blank#}2{#/blank#}把它买给他。

I look forward to {#blank#}1{#/blank#} when I enter Senior High School.

Mr Thompson is such a selfish man {#blank#}1{#/blank#} his neighbours．

There is only an apple at home. You should {#blank#}1{#/blank#}it {#blank#}2{#/blank#}your sister.

{#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} enjoy taking part in in this season?