The Greens _____ China for seven years.

—I’m worried about tomorrow’s math exam.
— ______ . I’m sure you will make it.

-What are you doing ?  -I am _____my dictionary. I want to ____the answer.

—Don’t eat too much candy, for it’s_____ your teeth.
—Oh,I get it.Thank you.

_____ my teacher, I passed the English exam.

Miss Gao has taught us English      two years. I have been here      two years ago.

— Have you returned the library book      ?
— Yes, I’ve       returned it.

—       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; i

—What was wrong with Lucy yesterday?
----An accident _____ her.

Xi’an is a city with many places of interest and _____ tourists come here every year.