How about the pollution in the countryside?－Luckily, it’s not as serious as _______ in the big cities.

The meeting will begin . [ ]

Is this ________ dictionary? —No, _____ isn’t _______ dictionary.

I lost my pet pig, but it came back yesterday.—As the saying goes: an old horse knew the way.

If Tom _____ here tomorrow, I _____ you.[ ]