六.选择填空(15分)
1. Great changes ______ in China in the past 20 years.
| A．took place | B．have taken place | C．were taken place | D．have been taken place |
153. Though our city has a good public transport system, _____ private car is becoming _____ popular means of transport.
| A．a; / | B．the; the | C．the; a | D．/; the |
154. Using renewable energy is a simple idea, but ______ we find it hard to put into practice.
| A．one | B．what | C．which | D．That |
155. In Beijing volunteers are making use of every minute to ______ their foreign languages because volunteers must pass a written test and an interview.
| A．polish up | B．take up | C．put up | D．make up |
156. As is known to all, hard work will _____ in time.
| A．pay out | B．pay back | C．pay up | D．pay off |
157. The journey that _____ change Toby’s life started in July that year.
| A．would | B．was going to | C．was about to | D．was to |