What’s the population_______theU.S.A.—– the U.S.A.has _______population of297 million.

If you think the price of pork is too high, you _____ as well buy some beef. It depends on you!

I can think of many cases ______students obviously know a lot of English words and expressions but couldn’t write a good essay .

. Not until _______ smoking ________healthy lungs.

You can’t see the___________ now for theyare having a meeting at the moment