You should never lose your temper with the students; ___, they are only kids.
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.
Many people agree that ___ knowledge of English is a must in ___ internationsl trade today.