If only I _______ more confidence in the English speech contest held last week!
A. would have B. had C. had had D. have
According to the school rules, no child _______ be allowed out of the school during the day, unless accompanied by an adult.
A. will B. would C. might D. shall
It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it.
A. when; which B. when; that C. that; which D. that; that
The moment I completed the 800-meter race in the school sports meet, my legs _______.
A. gave out B. gave away C. gave in D. gave up
We’ve just heard a warning on the radio _______ a typhoon may be on its way.
A. what B. when C. which D. that
Traditional Chinese medicine is thousands of years old and has developed _______ time.
A. over B. in C. on D. of