---This bag is too heavy for me. Could you please do me _____ favor? -----Sure . A. the B. an C. a
----What do you think of the weather in Nanjing? ----It’s warmer than________ in Beijing.
China is one of________ in the world.
Funny jokes can always make us _____ when we are sad.
He always looks. Now he's lookingat his new drawing.
People in Britain say “football” while people in the USA say ____.