Most people advise that students’ heavy burden __________.
I’d like to buy a house—modern, comfortable, and________in a quiet neighborhood.
—If you like I can do some shopping for you. —That’s a very kind __________.
—How often do you eat out? ________, but usually once a week.
There are certain _______when you have to interrupt people who are in the middle of doing something.
It’s bad ____ for a man to smoke in the public places where smoking is not allowed.