Tom _________ Mary in 1998. That is to say, they _________ for 12 years.

In the park , the number of the visitors is tightly ____ to avoid damaging the environment or putting stress on the animals.

On top of the mountain ______, which was built 2,000 years ago.

Could you please do me a favor—_____—I mean，could you help me

____ it be that is knocking at the door—It ______ be Father, but I’m not sure