Mary was silent during the early part of the discussion but finally she ____ her opinion on the subject.
A. gave voice to B. kept an eye on
C. turned a deaf ear of D. set foot on
（2016·天津）_____the average age of the population increases, there are more and more old people to care for.
A. Unless B. Until
C. As D. While
（题文）(2016•天津) —I’m thinking of going back to school to get another degree.
—Sounds great! ____________.
A. It all depends B. Go for it
C. Never mind D. No wonder
（题文）(2016·天津) It was really annoying; I ________ get access to the data bank you had recommended.
A. wouldn’t B. couldn’t
C. shouldn’t D. needn’t
The cooling wind swept through out bedroom windows, ____ air conditioning unnecessary.
A. making B. to make
C. made D. being made
When walking down the street, I came across David, when I _____ for years.
A. didn’t see B. haven’t seen
C. hadn’t seen D. wouldn’t see
