I’d like to have visited the Palace Museum, but something unexpected _______ to my father.
| A．had happened | B．happened | C．has happened | D．happens |
Is there anything ______?
| A．you are not sure |
| B．about which you not quite sure |
| C．that you don’t understand |
| D．which you don’t understand |
If he __________, he would have passed the examination.
| A．had worked hard | B．worked hard |
| C．has worked hard | D．works hard |
When we travel in other countries, we have to ________ lots of different customs.
| A．used to | B．get used | C．got used to | D．get used to |
Great changes ___ in the past ten years in China.
| A．took place | B．have taken place |
| C．were taking place | D．had taken place |
Many accidents _________ by careless drivers last year .
| A．are caused | B．were caused |
| C．have caused | D．will cause |