My son is only 12 years old, but he is ________ in our family. He grows so fast.

The red shoes ________88 yuan.

What’s the population ____ the U.S.A— The U.S.A has ____ population of 297 million.

nd Chris, volunteers from Australia, are said _____ our school as they have finished their teaching mission.

. It is ___ hall that holds 1,000 people.