--- 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
The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them．
A．can’t B．shan’t
C．needn’t D．mustn’t
