-_____the population of China?-_______over 1,300,000,000.
Why don’t you _____ to cassettes? A. listening B. listen C. listened
What _____ reading aloud to practice pronunciation? A. of B. about C. around
____ do you study for tests? I work with my friends. A. How B. Who C. When
I study math by ____ lots of exercises. A. did B. doing C. do
Nobody says a word about the accident, ______?