We all need knowledge from the past — ______ it comes from personal experience or from studying history. It is our only guide to the future.
You didn’t let me drive.If we ___ in turn, you ___ so tired.
Helen ____ her keys in the office so she had to wait until her husband ___ home.
After living in Paris for fifty years he returned to the small town __ he grew up as a child. A. which B. where C. that D, when
We decided not to climb the mountain because it was raining ___.
The number of people invited ___ fifty, but a number of them ___ absent for different reasons.