The population of many Chinese cities has_________ doubled in the past 30 years

Our supplies _____, so we must get enough of them before none is left.

What do you think of James—Well, his father, James sharing his things with others.

－Hi, Paul. Long time no see. _________? －I’ve just bought a new car. It’s great.

Did you attend Mary and Tom’s weddingceremony-Yes，but as you know，they________each other no more than 3 months．