—The meeting is about to start, yet the speaker hasn’t turned up.— No one knows ____.
(届江西省九所重点中学高三下学期3月联合考试英语试卷) —He thinks that girls are smarter than boys when it comes to learning English. —But two years ago he thought____.
(届湖北省黄冈市高三年级3月测试英语试卷) According to the latest research, getting enough sleep is _____to maintaining good health and reducing stress.
(届江苏省南京市高三第二次英语模拟试卷) One of the characteristics that make me different from many people is my adaptability—I'm _______ and comfortable in new or unusual situations.
(2014届浙江省宁波市十校高三3月联考英语试卷) Up to now, no one has come up with a(n) explanation of why dinosaurs died out, and it remains a mystery.
(届山东省济宁市曲阜师大附中高三上学期期中考试英语试卷) Be _____we can' t expect an absolute freedom of expression.