Choose the best answer a; b; c or d to complete

1.She said that is was       last house on the road

  A. the

 B. a

 C. an

 D. no article

2. He refused          after the trial

  A. comment

  B . to comment

  C. commenting

  D. to commenting

2 . A recent study of 2000 species of plants and animals have suggested an answer to this question .

  A. Study

 b. have

 c . to

d. . species