In some Western countries shops are closed ________ weekends.
—What’s the best time ________ a field trip?—I think it’s spring.
—I will call you ______ I get the ticket to the cinema.—It is very kind of you.
Betty will ring me up when she ________ in Shanghai.
—There are many traffic accidents today.—If people obey the traffic rules, there will be ____ accidents.
—I don’t know how to stop sad feelings—____________. I can help you