both leaving if heavy because less选一个合适的填入下列横线上
both leaving if heavy because less选一个合适的填入下列横线上
1 Every day millions of cars are driving on the streets and _______ dirty gas into the air.
2.It is harmful to ____ our health and the earth.
1 Every day millions of cars are driving on the streets and _______ dirty gas into the air.
2.It is harmful to ____ our health and the earth.
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你能帮帮他们吗