—_____ the population of the U.S.A. in 2005? —It _____ about 296 million. A.What is; is B.What was; was C.How many is; was D.How many was; is
Albert! It’s time for you to go to bed, _________ you will feel tired tomorrow.
While my brother _______ football with his friends yesterday, my sister _______ her homework.
—Excuse me, sir, smoking _________ in the gas station. — Oh, I’m really sorry.
Mr. Green with his sons and daughters often _________ a walk in the park after supper.
The _________ careful you are, the _________ mistakes you will make.