Rather than _____ at home, he always prefers _____ sports on the open air.
The book about environment ______ the importance of protecting the earth.
It was ______ back home after the experiment.
________ with the size of the whole earth, the biggest ocean does not seem big at all.
I would appreciate ______ if you could write to me as soon as possible.
They often quarrel with each other about small things, which they couldn’t ________ finally.