When did the computer crash?—This morning，while I ________ the reading materials downloaded from some websites.(2012·福建)

Our grade held the grown-up ceremony on March, 21st, _____ I have been well aware of my responsibility for our society [ ]

It was the driver rather than the passengers who was to for the accident.

Which of these two English books will you borrow—I’ll borrow ______ of them. Because they are very interesting.

Though Tom knew nothing about business, he succeeded ________ other more well-informed managers failed.