It is reported that a similar technique can be ________ to the treatment of cancer.
15.While he has failed again and again, he never gives up in order to________his dream.
14.This doubt had been in my mind for some time, but the research still went on____some reasons.
13.Not until I was a senior student_________the importance of English.
12.There is__________in what you say; I will take your advice.
11.—I passed my driving test at the first_________. —Congratulations!