It’s the fourth time that heavy smog has hit the city this month.— It’s high time we _______ measures to fight airpollution.

n’t go to that supermarket quite often, do you—-No，I only go there ________ because it’s too far away from my house.

_________, he would have been fired

canI do for you, sir— I want_____

Let’s go to the library for more books.I don’t think these all the problems of the subject.