.To improve your health, you can _________ 25— 30 minutes three or four times a week to do simple things such as walking ,cycling or running .
As is reported,it is 100 years ________ Qinghua University was founded.
He decided that he would drive all the way home instead of________at a hotel for the night.
The young lady prefers dressing up as a stranger for a party to________ by others.
Some parents are just too protective. They want to ________ their kids from every kind of danger,real or imagined.
The precious manuscripts were hopelessly________by long exposure in the cold,damp cellar.