---Your grandfather still seems very energetic, although he is already in his seventies now.
---Yes, he _______in the army for three years when he was young.
| A．would serve | B．served |
| C．had served | D．has served |
--- Catherine, I have cleaned the room for you．
---Thanks．You _______ it．I could manage it myself．
| A．needn’t do | B．shouldn’t have done |
| C．mustn’t do | D．needn’t have done |
It didn’t take the children long to________ the correct answer．
| A．carry out | B．figure out |
| C．turn out | D．give out |
_____ herself to science, the great scientist took little notice _____ the honors given to her．
| A．Devoted, of | B．Devoting, of |
| C．Devoted, about | D．Devoting, about |
The old couple, ____had been admitted to university, were living a hard life．
| A．both their children | B．both of whom children |
| C．both of whose children | D．whose their children |
---Has Peter handed in his paper yet?
---I’m not sure．He _______ on it last week．
| A．was working | B．has worked |
| C．worked | D．had worked |