Distinguished guests and friends . _____the ceremony of the 50th Anniversary this morning are our alumni (校友) from home and abroad .
Seldom ________ TV when he studied in senior high school.
Everything,unless otherwise ________,will go on as planned.
—It's a pity that Andrew didn't want to go to the conference. —________ willing to go,we could have paid all his expenses.
The warning we were given as children ________ an apple a day keeps the doctor away may,in fact,have a scientific explanation.
WalMart,the world's largest retailer(零售商),sells in three months ________ the numbertwo retailer Home Depot sells in a year.