_____ is even important _____ as the earth cooled down, water began to appear on its surface.

I like playing ____ football, but I don’t have _______ football now.—Let’s go walking in the playground.

The reason why I missed the party was that my car was _________ in the traffic jam.

to hospital in time, the patient infected withflu was saved at last

do you exercise — More than three times a week.