Read the following passage and mark the letter A, B, C or D to indicate the correct answer for each of the blanks from 6 to 15

A. listen

B. having listened

C. to listen

D. listening

A. helpful

B. helpless

C. unhelpful

D. helping

A. of

B. on

C. for

D. in

A. if

B. unless

C. after

D. before

A. diet

B. menu

C. slim

D. healthy

A. stressful

B. unforgettable

C. interesting

D. memorable

A. restless

B. endless

C. hopeless

D. worthless

A. who

B. what

C. that

D. which

A. Always

B. Every

C. Strongly

D. Regular

A. energetic

B. correct

C. well

D. good