As soon as I got on the bus I realized that I________ my papers in the house.
| A．left | B．was leaving | C．had left | D．have left |
Miss Chen can show you around _______ mountain, because she has ______ good knowledge of it.
| A．the; a | B．a; the |
| C．a; a | D．the; / |
The athletes competed ________ each other for gold medals in the Olympic Games.
| A．against | B．between |
| C．for | D．over |
All his free time is ______ by volunteer work, but he feels it meaningful.
| A．put up | B．given up |
| C．picked up | D．taken up |
Bill Gates is so _____ that he has given away most of his money to the poor.
| A．brave | B．smart |
| C．generous | D．skillful |
They are now holding talks in a friendly _________ in the meeting room.
| A．atmosphere | B．state |
| C．situation | D．position |