Wang Wei had served ______a volunteer for three years before he graduated from college .
—I ______ for you for two hours, but in vain. Where did you go? —I ______ at my uncle’s.
.This isn’t the most difficult one of the new words that ______ me in the passage.
According to the reports, one of the rare animals, ______ South China Tiger, is in ______ danger of dying out.
—Can I take your order now? —______. Could I have a few more minutes?
Afer decades of effort, the city is still trying to_______ how to ban smoking in public places.