Shortly after the accident，two _________police were sent to the sport to keep order.
| A．dozens of | B．dozens | C．dozen | D．dozen of |
— 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 |
Most British believe that there has never been a more splendid opening ceremony than_______ of the London 2012 Olympic Games.
| A．one | B．that |
| C．those | D．this |
Bears often hide themselves in places _______ can’t be found by hunters.
| A．which | B．in which |
| C．what | D．where |
The most popular food ______ on menus in western countries is hamburger.
| A．include | B．including |
| C．to include | D．included |
The girl’s years of hard training _______ when she finally won the first prize.
| A．went on | B．got through |
| C．paid off | D．ended up |