The fire, believed to due to illegal construction on the building’s roof, was brought under control after an hour.
| A．have occurred | B．occur |
| C．have been occurring | D．be occurring |
19. I wondered_____that made him so upset.
| A． how it was | B． which did it | C． what it was | D． who did it |
18. The stories of rescuing trapped strangers in the earthquake highlight the huge efforts_______by Haitians themselves, as well as aid workers from around the world.
| A． to be made | B． being made | C． having made | D． to have made |
15. With the reform of educational system, the teachers_____school I worked before have greatly changed their way of teaching.
| A．in whose | B．whose | C．in which | D．Which |
14. He successfully passed the exam and was _____to his ideal university.
| A．received | B．admitted | C．permitted | D．Moved |
13 ._______, he is famous for writing blogs.
| A． As he is a teacher | B． A teacher as he is |
| C． A teacher although he is | D． teacher as he is |