1.Christmas Day is _December 25. a.at b.on c.in d.by2.A big fire broke out _the night of October 29. a.at b.in c.on d.by3.They will stay in the mountain village _two months. a.in b.for c.after d.later4.He had learned 200 words_the end of last week. a.until b.by c.for d.at5.They will return these two books_. a.after b.long before c.before long d.about two days6.He will stay here for _to help us. a.sometime b.sometimes c.some
