If there are _______ people driving, there will be ______ air pollution.

--Which month has______ days in a year?  ----February.

Beijing, the capital of China, is one of _________ cities in the world.

___________ you eat,  ______________ you will be.

--- “ The T-shirt is too big for me, would you mind giving me a ___ one ?”---“Ok, here you are.”