It took them three hours ___ homework.
Tom is very________.He never cleans his room.
There are pandas,tigers and many________animals in the zoo.
—Jack is a(n)________young man.—That’s true.He always feels nervous when he speaks before people.
Lions like to eat________,but koalas like to eat________.
China plans to let tourists________the Xisha Islands in the South China Sea this year.