Liu Xiang is well known all overthe world, he ____ to appear in films.

___ the problem of land erosiongetting more serious, the government is searching for a way to deal with it.

Easter Island, which was almost uninhabited when it was discovered on Easter Day in 1722 by a Dutch captain, is covered with hundreds of giant statues, each ______ several tons.

We met an old friend in London _________ our expectation Shewaved at us ________ the street when she saw us

What do you think of SupermanI like him very much.He can fly____the sky.