Do you know the young man well?—Sure, we __________ friends since we met in Nanjing three years ago.

There ______ many hotels on Center Street.

The number of the students in our school is about nine ____. ____ of them are boys.—I think so.

.. The online exposure of the diary of a government official made the public realize the extent ______ the Internet affects the society.

Jake _____his key in the office so he had to wait until his wife _______ home.