—What’s this?—It’s __________ UFO.A.a B.an C.the
--_____________________--He is not very heavy and wears glasses.
-_____the population of China?-_______over 1,300,000,000.
In the UK, a lady usually doesn't like to be asked ___.
I didn’t believe he could drive ________he told me.
—Would you like to stay ____ days in Beijing?—No, thanks. I’m afraid I’ll be back tomorrow.