—_______will you come back home from vacation?—In two weeks.

As a good student, he’s seldom late for school in the morning, ___ he?

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

-- ________ does it take you to water the flowers?    

I told you the other day that Tom had agreed with your idea, ________?