Through thorough investigof polluted water.

He still drinks a lot and often gets drunk, do you know that? — Yes. But I don’t know how I can ____ him to give up. [ ]

He didn’t go to the concert yesterday, did he— _____. He was busy studying for the test all day.

Shall we ________John to help us with the project— I don’t think it’s a good idea. He has too muchwork to do.

_____ as much as one-fifth of the trees have been cut down.[ ]