---Do you know_______ the books on the shelves? --- Sorry, I can’t count them, because there are _______books. A. a number of; the number of B. a number of; a number C. the number of; a number of
We have __________ Art lesson every Monday.
--- Your picture is very good. --- ______________.
---Happy birthday to you ! . ---Thank you, I certainly will.
Half of the classdone most of the work. The restrather difficult.
The floor is so dirty .Would you please?