You may use my office as you like, you clean it up afterwards

My father likes playing golf；he’s really enthusiastic________it.

Why do you look unhappy, Lucy— I can’t learn math well I always work hard.

You know Cartoon World is on TV ________ 6:30 p.m. ________ 7:00 p.m.

(2013·高考北京卷)Experts believe________people can waste less food by shopping only when it is necessary.