If a person has not had enough sleep, his actions will give him ___ during the day.

--It’s reported that young people are responsible for 60% of the traffic accidents.---Exactly. Young drivers are far more _______ to drive faster than old ones.

 He saw the MP4 player a moment ago, but he didn’t know how it disappeared _______.

As these goods are of different styles, the prices ___ 100 yuan to 9 yuan.

—How did you find your trip to Europe?—         in my life had I felt so great. The food and the service were satisfactory.