He flew to Paris two hours ago，he would stay for three days

______plastic bags we use, _____ it will be to the environment.- I agree ________ you.

________ careful you are， _______ mistakes you will make.

________it seems to make sense, but if you think about it, the rule misses the point.[ ]

Lily has a silk __________. Listen, she is singing in the next room!— How nice!