It is known to us that doing eye exercises ________ our eyes, and that is to say, our eyes can ________ doing eye exercises.
_____ in the iron cage of the zoo, the tiger got quite angry.
No sooner _____ back to the kitchen than the doorbell rang.
It is no use fishing for golden fish in this river; there are _____ left.
Writing has _____ much of my spare time, but it has given me a great deal of pleasure.
_____ is no possibility that Bob can win the first prize in the match.