Although thunder and lightening are produced at the same time, light waves travel faster _____, so we see the lightening before we hear thunder.

A. to rescue                   

B. to have rescued         

C. rescuing           

D. to have been rescued

A. worthless                 

B. priceless                    

C. valueless                   

D. worthy

A. what you have experienced                    

B. your bio data and special qualities

C. your own qualities in real life                

D. what you have earned through study

A. Yes, I don’t mind                                   

B. No, do as you please

C. No, I mind                                             

D. Yes, do as you please

A. playing down

B. turning around          

C. keeping down 

D. pushing back

A. OK, let me just check the diary.            

B. Ok. He can't be disturbed.

C. OK, you will need to check my diary.    

D. Have a seat and I'll be with you in an hour

A. Though for children written                  

B. Though written for children

C. Though it written for children                

D. It was written for children