---         is it from your home to your school?---It is about twenty minutes by bike.

It was not until the 18th century that man realized that the whole of the brain was involved in the working of the mind，　　　　？

We'd better get up earlier than usual if we want to catch the train, ______?

—              is your little brother like? — He's lovely.

—Does Bob have vegetables for dinner?—______. But his sister has some carrots.