One of the requirements for a fire is that the material _________ to its burning temperature.

The Foreign Minister’s Five-day visit to this island country, ______to promote the relationship between them, turned out to be a failure because of their differences about nuclear weapons

How do the shops make money if they sell at such low prices?-Manufacturers, it seems, are willing to bring down prices _______ big volume purchases．[ ]

hristmas, The Washington Post published an essay_______ what kind of Christmas dolls are popular with children in China

I’ve never________to the Great Wall．