Some scientists are trying to eliminate malaria by developing a GM mosquito that can’t transmit the disease.

A. He has spent many days writing his linguistics term paper.
B. He spent one day working on his linguistics term paper.
C. His term paper on linguistics was done yesterday.
D. His linguistic term paper was due several days before yesterday.

A. His paper has been published with the help of his adviser.
B. His paper has won an award with the help of his adviser.
C. His paper has been revised by his adviser.
D. His paper has got the approval from his adviser.