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题型：单选题 题类：常考题 难易度：普通
现在进行时——表示反复出现的习惯性动作
Humans {#blank#}1{#/blank#}（pollute） the earth all the time and there is not enough clean air and water．
一Sorry, I for an English test．
He is {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.
The other half is learning {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} your teammates and {#blank#}5{#/blank#} {#blank#}6{#/blank#} your mistakes.
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