If ________ the same treatment again, he is sure to get well [ ]

It is obvious that water is to be _____to the development of life.

What do you think of investing in today’s stock market? — There are many risks, but also many gains．

The windows must have taken you quite a long time that day——RightThey for weeks

I __________ agree with what he said Actually I feel what he said is much to the point and makes good sense — Yes, I think so