In fact, more and more people ____ to live a greener, healthier and more environmentally “green life”．
| A．chose | B．choose | C．are choosing | D．have chosen |
Unless ____ to speak, you should remain silent at the conference.
A invitedB invitingC being invitedD having invited
I’ve bought an English dictionary which you can ____ if you meet new words.
A get toB come toC refer toD look up
Every possible means_____ been tried，and we find only______ this means can we do it well．
| A．have，in | B．have，by |
| C．has，in | D．has，by |
Because of too many differences between the two sides, a lot of questions are still left ________.
A in the airB on the airC by the airD through the air
______ it is to learn English on the internet!
| A．What a fun | B．What fun | C．How a fun | D．How fun |