19. The orphan was brought _____ by the villagers and 20 years later he became the village Party branch secretary.
| A．up | B．on | C．down | D．Off |
After 15 years in the USA, he finally decided to ________ American citizenship.
| A．concentrate on | B．apply for |
| C．put off | D．lead to |
Nowadays, China has become the largest consumer of mobile phones. _______, every person has one mobile phone.
| A．Above all | B．In other words | C．On the whole | D．On average |
Better _______ the local customs or you will have a hard time.
| A．form | B．develop | C．respect | D．spread |
I wondered what great difficulty he had ________ the plan.
| A．to carry out | B．carrying out | C．carried out | D．with carrying out |
It was the third time that I ________ of the changes of the timetable.
| A．had informed | B．have informed |
| C．had been informed | D．have been informed |