There are many new central leaders in China now, ________ many once worked in the western provinces.
| A．in which | B．of whom |
| C．in whom | D．for whom |
With the exam ______ in ten minutes, they were asked to hand in their mobile phones.
| A．taken place | B．taking place |
| C．having taken place | D．to take place |
More than one doctor _____ involved in the rescue that took place after the earthquake.
| A．was | B．is | C．were | D．are |
Some hard-working students always keep a torch in their dormitories _____ there is a power failure.
| A．if | B．unless | C．so that | D．in case |
_____ in charge of two classes made Mrs. Li, head of Senior Grade 3, extremely tired.
| A．Leaving | B．Left |
| C．Being left | D．Having left |
Almost every teenager will experience a period in their life _____ they aren’t content with their parents.
| A．when | B．where | C．that | D．which |