Air is very important to everything that lives. But the air we breathe is g小題1:___ dirty. People all over the world are looking for w小題2:___ to make it clean again.
Have you e小題3:__ watched the smoke from chimneys rising high in the air? Have you s小題4:__ the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g小題5:___ to breathe. If we want to keep well and strong, we need to breathe c小題6:__ air.
W小題7:___ more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p小題8:___.
Scientists have a小題9:__ found ways to stop or slow down some of the things that make the air dirty. They will not stop working u小題10:__ we have clean air again.

小題1:.getting
小題2:ways
小題3:ever
小題4:seen
小題5:good
小題6:.clean
小題7:With
小題8:pollution
小題9:already
小題10:until

小題1:本句的含義為我們呼吸的空氣正在變臟,故本句空格處填變的現(xiàn)在分詞形式getting。
小題2:本句的含義為全世界的人都在尋找使空氣干凈的方法,故本句空格處填方法的單詞ways。
小題3:本句的含義為你曾經(jīng)看過煙囪里的煙冒到空氣中,故本句空格處填曾經(jīng)的單詞ever。
小題4:本句的含義為你看見汽車或飛機(jī)所排放的煙,故本句空格處填看見的過去分詞seen。
小題5:本句的含義為呼吸排放到空氣中的煙是不好的,故本句空格處填好的單詞good。
小題6:本句的含義為我們需要呼吸清潔的空氣,故本句空格處填清潔的單詞clean。
小題7:本句的含義為隨著越來越多的工廠和汽車,飛機(jī),處理空氣污染越來越難,故本句空格處填伴隨的單詞With。
小題8:本句的含義為處理空氣污染越來越難,故本句空格處填污染的單詞pollution。
小題9:本句的含義為科學(xué)家已經(jīng)找到阻止或減慢空氣污染的方法,故本句空格處填已經(jīng)的單詞already。
小題10:本句的含義為直到我們有清潔空氣的時候,他們才停止采取措施,故本句空格處填直到……為止的單詞until。
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