Though we have been staying up for days, there’s still _____ work remaining to be done.
| A．a large sum of | B．a plenty of | C．a large amount of | D．a large number of |
She is my best teacher ______ help I have made great progress．
| A．with whom | B．whose | C．which | D．with whose |
E-mail, as well as telephones, ___ an important part in daily communication.
| A．have played | B．is playing | C．are playing | D．play |
In order to make our city green, _________.
| A．it is necessary to have planted many trees | B．many more trees need to plant |
| C．we must plant more trees | D．our city needs more trees |
He was about to tell me the secret _______ someone patted him on the shoulder.
| A．as | B．until | C．while | D．when |
We may go to Hawaii or California._______ , we have to find a way to escape the snow this winter.
| A．Also | B．In addition | C．Somehow | D．Anyway |