_____ electric eels send a series of blips of electricity into the water around them and they can detect the pattern of electricity of the water changes.

A. All of   

B. Every  

C. All 

D. Of each

It is really an ____.

A. . undergraduate interesting economics course           

B. economics course interesting undergraduate

C. . interesting economics undergraduate course           

D. interesting undergraduate economics course

Allan: “Do you mind if I use your dictionary?”             Nick: “ _________.”

A. Without doubt 

B. No, feel free     

C. I’m afraid not  

D. Straight ahead