Hernew book is about a murder mystery ________ on actual murders that took placein Florida several years ago.

How soon will Harry be back —–He said he would come back _____ twodays.

You shouldn’t have talked back to our teacher like that. It was awfully impolite.— You are right. I _________ crazy at that moment. [ ]

Did Tom come back late last night?——No. It was not yet 8 o’clock ____ he arrived home.

You see, “Food Safety” receives thousands of Internet hits a day.—Yes, it becomes one of the _________ topics(话题) these days.