---I find the more we study, the more difficulty we have ________ out Maths problems.---Oh, I agree with you. Maths is more and more difficult.

Class is over. Let’s stop______ a rest.

—Doctor, I am afraid I am getting fat these days.—     slim, you should change your diet and lifestyle.

At present, more and more people prefer _________ in the countryside because there is _____ pollution in the city.

You look _______ . Do you hear the _________ news?