---Will he come to our dinner?
---He says that he will not come ________.
| A．unless being invited | B．if inviting |
| C．unless invited | D．if invited |
Teachers’ Day is a time to be________to all teachers who deserve special recognition.
| A．available | B．grateful |
| C．generous | D．ridiculous |
Air pollution is getting more and more serious，so we must take action________it is too late.
| A．before | B．after |
| C．until | D．when |
The footballer didn’t succeed in scoring，though________several chances by his teammates.
| A．was given | B．being given |
| C．giving | D．given |
You should study the details of the policy________before you sign it.
| A．in return | B．in advance |
| C．at ease | D．on purpose |
Jogging every morning is________good habit.Stick to it，and you’ll make________great progress.
| A．a；/ | B．a；a |
| C．the；a | D．/；/ |