House owners        keep their gardens in a neat and orderly state according to the regulations.

The young trees should ______well as often as possible.

- Tom, where is your father?- I’m not sure. He _______ in his office.

 When Marx was in London, he  __   read at the library for hours.

--Let’s go to the Tian’anmen Square by taxi. --Oh, it’s not far from here. We_______ take a taxi.