This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.
Grandpa was shocked by the news. Rarely ______ him so quiet.
It suddenly occurred to him he had left his keys in the office.
It’s been discovered in the study ______ people are more relieved after forgiving others.
____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.
______ Stephon Marbury is an American, he has become a role model among Beijing basketball fans.