13．About 90 percent of the equipment presented by the administration，as well as the facilities ofour own，______made good use of in teaching．

It doesn’t matter ________ you pay by cash or credit card in this store

Please don’t make a noise. —_______. I’ll be as quiet as a mouse.

My pen-friend，Peter，wrote to me，expressing the hope _____ he would come to Beijing to see the 2008Olympic Games．

______ it is to go for a hike in such lovely weather!