It was 1995 __________ we began to develop the new computer system.
If we expect ________ much cleaner world, we should attract ________ world's attention to protect it.
— Mom,Dad is smoking again! —Well,let him cut it ________ gradually since old habits die hard.
It was quite a job for her to ________ several children all by herself during the war.
As we have known from the map of the world,this is ________.
If your father knows that you cheated in the exam,he will be ________ a little angry.