Generally speaking, a middle student _______ his / her family lots of money for education．

 It ____how long the shock that explosions hit London transport system will stay in people's hearts.

The traffic problem we are looking forward to seeing _____ should have attracted the local government’s attention.

The book ____ three Yuan, but it only ____ me two Yuan.

 Somehow, the old man had ________ a dangerous secret, one which could not be discussed in a room on a military base.