Air is very important to everything that lives.But the air we breathe is g________dirty.People all over the world are looking for w________to make it clean again.Have you e______watched the smoke from chimneys(烟囱)rising high in the air?Have you s

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Air is very important to everything that lives.But the air we breathe is g________dirty.People all over the world are looking for w________to make it clean again.Have you e______watched the smoke from chimneys(烟囱)rising high in the air?Have you s

Air is very important to everything that lives.But the air we breathe is g________dirty.People all over the world are looking for w________to make it clean again.Have you e______watched the smoke from chimneys(烟囱)rising high in the air?Have you s
Air is very important to everything that lives.But the air we breathe is g________dirty.People all over the world are looking for w________to make it clean again.
Have you e______watched the smoke from chimneys(烟囱)rising high in the air?Have you s________ the smoke from cars and trucks on roads or the smoke from planes?The smoke is not g_________to breathe.If we want to keep well and strong,we need to breathe c________air.
W________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________.
Scientists have a_________found ways to stop or slow down some of things that make the air dirty.They will not stop working u_________ we have clean air again.

Air is very important to everything that lives.But the air we breathe is g________dirty.People all over the world are looking for w________to make it clean again.Have you e______watched the smoke from chimneys(烟囱)rising high in the air?Have you s
getting
ways
ever
seen
good
clean
with
pollution
already
until

依次是getting ways ever seen good clear while problem always until

1.going 2.ways 3.ever 4.seen 5.good 6.clean 7.with 8.polluting 9.already 10.until

going ways ever seen good clean with pollution already until