Garter Druse _____ his being selected for the important task to his courage，devotion and knowledge of the area.
| A．led | B．owed | C．devoted | D．thanked |
—You ought to have made an apology to Tom yesterday evening．
—Yes, I know I ____．
| A．ought to have | B．have to | C．should | D．must have |
The government officials met the workers and engineers working on the stadium, most____ were migrant workers．
| A．of which | B．of who | C．of whom | D．of them |
—Why are you so late?
—The driver couldn’t see clearly because of the fog．____, the road was too icy．
| A．Therefore | B．Otherwise | C．However | D．Besides |
With your brother’s help, I’ve made great progress in English and I really want to do something for him ____．
| A．in turn | B．by turns | C．in return | D．in answer |
—I am afraid this pair of shoes is a little expensive．
—If you really want to buy them, I will give you a ____ of 10 percent．
| A．quantity | B．amount | C．discount | D．account |