—How long _____each other before they _____here?
—For about a year.
A. have they known, come B. did they know, came
C. do they know, come D. had they known, came
Three-quarters of the land _____covered with green grass .while the rest _____covered with pine trees.
A. is, is B. is, are
C. are, is D. are, are
I don’t think he came yesterday, _____?
A. did he B. do I
C. didn’t he D. do he
_____useful information it is!
A. How B. What
C. What a D. How a
If I were you, I _____him for his help.
A. thanked B. will thank
C. thank D. would thank
Two _____students gathered at the school gate to have a meeting.
A. hundreds B. hundreds of
C. hundred D. hundred of
