The best way to make them work hard is to promise them reward.

A. Unless you don’t try to work hard, you will fail in the exam.

B. Unless you try to work hard, you won’t fail in the exam.

C. Unless you try to work hard, you will fail in the exam.

D. Unless do you try to work hard, you will fail in the exam.

A. The cost of living is so high that they couldn’t keep with it.

B. Despite the fact that old-age pensions have risen considerably, the cost of living isn’t going down.

C. Old-age pensions may have risen considerably, but they haven’t kept pace with the cost of living.

D. The cost of living hasn’t been kept with no matter how high the old-age pensions are.

A. Mai speaks English more fluently than no one in our club.

B. Mai is the worst English speaker in our club.

C. Mai speaks English as fluently as other people in our club.

D. Mai speaks English the most fluently in our club.

A. Dave is taller student in the class.

B. Dave is the tallest student in the class.

C. Dave is the taller student in the class.

D. Dave is tallest student in the class.

A. He doesn’t drive as carefully as he used to.

B. He doesn’t drive carefully than he used to.

C. He doesn’t drive as carefully than he used to.

D. He didn’t drive as carefully he does.

A. Although we tried very hard, we failed in the final match.

B. We made all our efforts so that we could gain success in the final match.

C. Whatever efforts we had made, we weren’t able to win in the final match.

D. We failed in the final match as a result of all our great efforts.

A. None of the people that watched the game will ever forget it

B. The people watched the game none of whom will ever forget it

C. Nobody that watched the game will ever forget it

D. Both A and C are correct.