In American, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.
Miss Gao is always kind _____ her students. They love her very much.
—______ English lessons do you have on Friday? —Two.
—How long can I _____ the VCD? —A week.
—What do you usually do _____ weekdays after school? —I usually read books.
—_____ does Kangkang meet his friends? —Four times a month.