Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions.
Some snakes have hollow teeth they are called fans that they use to poison their victims.

A. enough intelligent  

B. to pass                   

C. economics              

D. help

A. Ways of teaching                                  

B. Ways of giving assignments

C. Ways of using the textbook                   

D. Ways of taking an exam

A. hadn’t been invited                      

B. not have been invited

C. haven’t been invited                              

D. not be invited

A. are arriving            

B. have arrived           

C. has arrived             

D. is arriving

A. single         

B. scarce        

C. lonely        

D. unique

A. Very often it’s to get a better job           

B. All of them are

D. I heard it was very good

A. To be successful on the Internet            

B. Support from Youniversity Ventures

C. Sharing Success on the Internet             

D. The best videos from YouTube