Try ____ she might, Sue couldn’t get the door open.
| A．if | B．when | C．since |
D．as |
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 |
_______ well prepared a gymnast is, he still needs a lot of luck in performing.
| A．Whatever | B．Although | C．No matter | D．However |