Rescuers are ______ for the safety of the two men trapped in the mine.
A. grateful B. concerned C. extreme D. frightened
--- How many times have you been to China?
--- In fact, it is the first time that I ______ here.
A. was B. am C. had been D. have been
Please ______ the numbers and I’m sure they will ______ more than 1, 000.
A. add up; add to B. add up; add up
C. add up; add up to D. add to; add up
The policemen had no ______ in finding the knife that the murderer had thrown.
A. difficulty B. troubles C. problems D. question
An athlete can’t play balls well without severe ______.
A. exercise B. teach C. education D. training
I ______ the time ______ so quickly.
A. didn’t realize; had passed B. don’t realize; passed
C. haven’t realized; passed D. hadn’t realized; had passed
