We spent about one-third of our lives sleeping. We know relatively little about sleep.

A. The plants which live on that island may develop differently.

B. The plants live on that island may develop differently.

C. The plants which lives on that island may develop differently.

D. The plants which live that island may develop differently.

A. If you refused to be arrested, you have to give a breath sample.

B. You could be arrested for not giving a breath sample to the police.

C. If a breath sample is not given, the police will refuse to arrest you.

D. The police could cause you to give a breath sample to decide whether to arrest you or not.

A. Jack has won a jackpot prize, 10% which half was donated to flooded areas.

B. Jack has won a jackpot prize, 10% of which was donated to flooded areas.

C. Jack has won a jackpot prize, 10% of that was donated to flooded areas.

D. Jack has won a jackpot prize, which was donated to flooded areas.

A. It is important for me to send letters to my friends abroad to keep them up to date on events in my life.

B. I keep in touch with my friends in foreign countries by writing to them from time to time.

C. My friends try not to lose contact with me by writing very often.

D. In order to not lose touch with my friends abroad, I write to them on a regular basis.

A. In spite of intelligent, she doesn’t do well at school.

B. Despite being intelligent, she doesn’t do well at school. 

C. Even though her intelligence, she doesn’t do well at school.

D. In spite the fact that she is intelligent, she doesn’t do well at school.

A. The passengers, most of them were full of, began to pull out the buses.

B. The passengers, most of whom were full of the buses, began to pull out.

C. The buses, most of them were full of passengers, began to pull out.

D. The buses, most of which were full of passengers, began to pull out.

A. It took me long to stop disappointing you

B. Getting over the disappointment took me a long time than the match.

C. Losing the match disappointed me too much.

D. It took me long to forget the disappointment of losing the match.