Traveling around big cities by taxi can cost a lot ofmoney, but it’s usually totake the underground train to most places.

The price of food, drinks, clothes _____ so quickly these years.—Oh, no, but I don’t think so.

How much shall I pay for the phone call — You ________ This is free of charge

“Are you going to the super market?” “ No,_____.”

The world’s population is getting larger and larger,so scientists are trying to _______ new ways to solve the food problem.