One of the popular expressions in 2012 “Positive energy”.
A. is B. are C. was
It's getting dark. Please the light.
A. turn on B. turn off C. turn down
At times, parents find it difficult with their teenage children.
A. talk B. talked C. to talk
When H7N9 bird flu first appeared, people didn't know doctors could cure it.
A. if B. that C. what
—Can I park my car in front of the building?
—No, you________.
A. won't B. can't C. needn't
Many people do not realize the importance of health _____ they have fallen ill.
A. until B. while
C. when D. after
