It was 1969___ the American astronauts succeeded in landing on the moon.

It was ______ back home after the experiment. 

____ with a difficult situation, Arnold decided to ask his boss for advice.

_____ the child to bed, she began to correct the pupil’s exercise.

 They want to make _______ clear to the public that they are doing an important and

necessary job.

You        very fast if you went from New York to Boston in six hours.

Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.

The report was not concrete and in a way lacked persuasion, but _____,I felt it is fair.

 Little ______  that we were watching his every move，so he seemed to be going his own way in this business.

I know Mr. Shuili; we ______ to each other at an English lecture.