Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.
A. a great deal of B. quantity of
C. quite a few D. a large number of
I don’t think _________ possible to master a foreign language without much memory work.
A. this B. that C. its D. it
She has already tried her best. Please don’t be too ______ about her job.
A. special B. responsible
C. unusual D. particular
Food safety _____ to customers, which should be the minimum requirement for the food industry.
A. guarantees B. is guaranteed
C. is guaranteeing D. guaranteed
His being late for the performance __________ a complete failure
A. resulted in B. resulted from
C. as a result of D. as a result
It’s already 10 o’clock. I wonder how it ______ that she was two hours late on such a short trip.
A. came over B. came out
C. came about D. came up
