Nancy reminded me of what I should ________ have forgotten.
Before you pay a visit to a place of interest, look in your local library________a book about it.
Everything comes with ________ price;there is no such ________ thing as a free lunch in the world.
Many people agree that ________ knowledge of English is a must in ________ international trade today.
In the market,vegetables are sold by ________ kilogram,I mean,by ________ weight.
—John has put forward ________ most challenging question for us to answer. —Yes,it really is.I have never heard ________ harder one.