_____ is known to everybody, the moon travels round the earth once every month.
I can think of many cases ______ students obviously knew a lot of English words and expressions but couldn't write a good essay.
---I'm sorry I stepped outside for a smoke. I was very tired. ---There is no ______ for this while you are on duty.
.It ______ to me that I should pay a visit to my friend Jane next week.
Public attention at the moment is ______ on the problem of how to create opportunities for the laid-off workers.
.His conclusion, ______ on careful research, was acceptable.