---Do you know_______ the books on the shelves? --- Sorry, I can’t count them, because there are _______books.A. a number of; the number ofB. a number of; a numberC. the number of; a number of
–Hi, Bruce! I haven’t seen you for such a long time. It _______ that you’ve changed a lot. –Yes, time flies!
--How many boys _______ in your group? --Four.
–At our school, we have to _______ uniforms every day. –So do we.
After visiting different countries, I found _______ very important to learn about table manners.
–Lucy, please don’t play with fire! –_______.