根據(jù)句意，用所給動詞的適當(dāng)形式填空。
小題1:We will have a picnic on May Day if it _______(not rain).
小題2:He ______ (wash) his car when I went to visit him yesterday.
小題3:We are all working hard ______(realize)the China’s Dream.
小題4:In the past few weeks, many special things _________(take) place in the world.
小題5:As we all know PM2.5 ________(cause) by air pollution in some parts of the country.

小題1:doesn’t
小題2:was washing
小題3:to realize
小題4:have taken
小題5:is caused

試題分析：
小題1:當(dāng)主句描述將來動作時，英語條件狀語從句用用一般現(xiàn)在時態(tài)表示將來動作。從句主語it是單數(shù)第三人稱，故填doesn’t。
小題2:根據(jù)下文時間狀語從句when I went to visit him yesterday ，可知主句描述的是過去某時正在進行的動作，故用過去進行時態(tài)。主語He是第三人稱，故be動詞用was，填：was washing。
小題3:動詞不定式做目的狀語表示具體的將要進行的動作，故填：to realize
小題4:根據(jù)前文時間狀語In the past few weeks,可知本句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。填：have taken。
小題5:句意：眾所周知，在國家某些地方，PM2.5是由空氣污染造成的。結(jié)合語境可知本句描述的是客觀性事實，故用一般現(xiàn)在時態(tài)。主語PM2.5表示抽象含義，故be動詞用單數(shù)。主語是動作對象，故用被動語態(tài)，填：is caused。
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