According to a recent survey, the ________ age of students of Senior Two is seventeen.
| A．common | B．ordinary | C．usual | D．Average |
______to the sun for too long, I think, can hurt your skin.
| A．Being exposed | B．To expose | C．Exposing | D．Exposed |
—We were surprised to hear that the reason_______ she gave for her absence was______ her mother was ill.
—Yes，we saw her mother was at the supermarket that morning.
| A．why；that | B．which；that | C．that；because | D．why；because |
—I wonder what makes you a successful manager.
—I ________ as a waiter for five years，which contributes a lot to my today’s work.
| A．serve | B．have served | C．had served | D．served |
Due to the widespread ________ of this medical technology，more diseases can be discovered and treated at an early stage.
| A．presentation | B．application | C．qualification | D．appreciation |
The book was written ______ careful observations and detailed studies.
| A．on behalf of | B．regardless of | C．on the basis of | D．in relation of |