If you don’t keep the meat in the refrigerator on such a hot day, it may ____.
There are a large number of plants existing on earth, however, very little _______ was made of them to feed us.
--- I’m terribly sorry, but I made a mistake again. --- _______. Practice more and you’ll succeed.
Doubting that the traveler carried drugs, the Customs officer stopped him and _______ his suitcase, but found nothing at all.
It’s such a surprise! Never did she dream of _______ a chance for her to be sent abroad for further study.
---Where did you ______ our chemistry teacher? ---It was in the supermarket ______ I purchased moon cakes.