We work together to achieve our common purpose：_________world that is safer, cleaner and healthier than one we found．
| A．the；the | B．a；不填 | C．a；the | D．the；不填 |
It was a real race________time to get the project done.Luckily，we made it.
| A．over | B．by | C．for | D．against |
A serious study of physics is impossible________some knowledge of mathematics.
| A．against | B．before | C．beyond | D．without |
I have an appointment ________ Dr.Smith, but I need to change it.
| A．to | B．off | C．with | D．from |
________everyone here，I wish you a pleasant journey back to your country.
| A．By means of | B．On behalf of |
| C．In search of | D．For fear of |
I am always delighted when I receive an e－mail from you.________the party on July 1st，I shall be pleased to attend.
| A．On account of | B．In response to |
| C．In view of | D．With regard to |