Humans are destroying nature day by day, ________, of course, will cause punishment sooner or later.
It suddenly __________ to the detective that the millionaire was probably murdered by his own daughter.
It suddenly __________ to me that they went there by bike.
By hiking, people can __________ nature and enjoy a new kind of life.
-How did you find the rock music concert last night? -__________.
There were only __________ as ten years ago on the hill.