.He is said________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A. to have written B. to be writing C . having writing D writing
The library needs _____,but it’ll have to wait until Friday．
| A．cleaning | B．to clean |
| C．being cleaned | D．to being cleaned |
--- 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 |