China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it. 

I ____________ you not to move my dictionary—now I can’t find it. 

By the time Jack returned home from England, his son  _______  from college.

Last year I applied to Princeton University. I ________ they would say yes — but they did, and now here I am．

—Good morning，Doctor Brown’s office.—Hello, this is Tom Smith. Could you please tell Doctor Brown I      ? My car       start.