This machine is very easy ______. Anyone can learn to use it in a few minutes.
Can you tell me if you have found the key ________ your car.
Sometimes ________ English is quite different from _______ English in many ways.
_____ of the students who took part in the military training is 450.
We discussed where to go for a whole morning, but we decided to stay at home_____.
Mr. Huang will ________ in the movement.