—What do you think of it?—Well,it’s worth doing ________ the result is satisfactory.
China has been pushing the reform of public hospitals ______ all its citizens.
It is described in her new book, one about sea life, ______this kind of fish lives in the deep sea.
Why do you insist on buying a car _______you have such good public transports here?
Though he is always thinking much of himself, he ______ be helpful when staying with others.
I didn't know his telephone number, otherwise I ______ him.