In many factories computers have ___________ the work of thousands of workers.
| A．taken place | B．taking place | C．taken place of | D．taken the place of |
You can pay now or ______ you come back to pick up the bike.
| A．then | B．when | C．while | D．as |
Tom, who had expected how it would go with his son, had a great worry ____ his mind.
| A．on | B．in | C．with | D．at |
There is no experience you can have ______ is more exciting than skating on real ice.
| A．of which | B．what | C．that | D．with whom |
BMW’s boss _____ the decision to fire 8,000 employees, saying the group needed to continue cost-cutting.
| A．witnessed | B．advised | C．defended | D．adopted |
Mr. Black left for Beijing this morning, his secretary ______ him there this Friday.
| A．joins | B．joined | C．joining | D．to join |