单选题 Although he studied hard, ______ he failed to pass the exam.

单选题 Everyone was ______ by his great progress.

单选题 Unless ______ to speak, you should remain silent at the meeting.

单选题 Miss Liu said ______ she would leave the book on her desk.

单选题 He spent a lot of money ______ books and magazines.

单选题 We should learn from those ______ are always ready to help others.

单选题 He likes ______, but he wouldn't like ______ today because it is very cold.

单选题 If I eat ______ food, I may become very fat.