发泡塑料餐盒和塑料购物袋大量使用,严重污染环境,危害人们的身心健康。这启示我们在消费过程中,要遵循保护环境,绿色消费原则。绿色消费的核心是
Not until all the fish died in the river ____________ how serious the pollution was.
If he ___________ my advice then, he would not be in trouble now.
It doesn’t matter ___________ you turn right or left at the crossing — both roads lead to the park.
It was in the school __________ he had studied ___________ he began the important experiment.
I felt somewhat sad and was about to leave _________ something happened which drew my attention.