—_____ the population of the U.S.A. in 2005?—It _____ about 296 million.A. What is; is B. What was; was C.How many was; was
-- It’s dangerous to walk across the street carelessly. --You’re right. We can’t be ________ careful while crossing the street.
If we don’t study hard, we will in our class.
I don’t know if she ____________ if it _____________ tomorrow.
How much difficulty did you have ________________ this problem?
Nanjing is _______ capital of Jiangsu and it is _______ city with many places of interest.