根据句意，用括号内所给动词的适当形式填空。（必要时加助动词或情态动词）
My father is very busy.  He             (go) to work early every morning.
Doctors often tell us               ( drink) more water every day.
--Where is Jim now?
--He             (water) some flowers in the garden.
Chinese writing brushes _________________ (make) of bamboo and animal’s hair.
—What’s your plan for the coming holiday?
—I _________________ (visit) Beijing if possible.
The naughty boy _________________ (play) computer games when his mother came in.
Mr. Green is an engineer. He _________________ (work) in China for about two years.
He stopped _________________ (speak) and there was not a sound in the room.
The medicine _________________ (keep) away from children.
Jack _________________ (begin) to write a book about his journey two weeks ago.