The more one is ______the English-speaking environment, the better he or she will learn the language.
It's no longer a question now _____ man can land on the moon.
—Do you know where the manager lives? —Yeah, but I have to _____ the telephone book for his address.
Whenever his mother spoke to him, ____ was fairly often, he would talk on and on without giving her a chance to speak.
After the new machine was introduced, the factory produced _____ in 2011 as the year before.
There ____ a temple on the side of the mountain, didn't there?