— the population of the U.S.A. in 2009?—It about 309 million.A.What is; is B.What was; wasC.How many is; was D.How many was; is
he isn’t tall, he is strong.
He showed me
—do you visit your grandpa? —Twice a week.
There are many important things on the blackboard. The teacher asks us to ______.
Please stop to have a rest. I think, to teenagers, health is as __________ as their study.