The air that surrounds our planet is both odourless, colourless, and invisible.

     A. The air                      B. our planet                 C. both odourless          D. invisible

Some of the agricultural practices used today is responsible for fostering desertification.

     A. of                             B. used                          C. is                               D. fostering

What I told her a few days ago were not the solutions to most of her problems.

            A. What I told            B. were            C. to    D. most of

She doesn’t want to go to their party. We don't want to go either.

     A. Neither she nor we don’t want to go to their party.

     B. Neither we nor she wants to go to their party.

     C. Either we or she doesn't want to go to their party.

     D. Neither we nor she want to go to their party.

He did not work hard. He failed the exam.

     A. Unless he had worked hard, he would have failed the exam.

     B. Even though he failed the exam, he didn’t work hard.

     C. If he had worked hard, he would have passed the exam.

            D. However hard he worked, he failed the exam.

“If I were you, I would go to the doctor.” David said to Claudia.

     A. David advised Claudia not to go to the doctor.

     B. David told Claudia that he would go to see the doctor.

     C. David advised Claudia to go to the doctor.

            D. David told Claudia to become a doctor

John was not here yesterday. Perhaps he was ill.

     A. John needn’t be here yesterday because he was ill.

     B. Because of his illness, John shouldn’t have been here yesterday.

     C. John might have been ill yesterday, so he was not here.

     D. John must have been ill yesterday, so he was not here.

Were it not for the money, this job wouldn’t be worthwhile.

     A. This job offers a poor salary.

     B. This job is rewarding at all.

     C. The only thing that makes this job worthwhile is the money.

     D. Although the salary is poor, the job is worthwhile.

A thrifty buyer chases fruits and vegetables in season.

     A. professional              B. economical               C. careful                      D. extravagant

Your experience with oil well fires will be invaluable to the company in case of trouble

     A. precious                    B. priceless                    C. important                  D. worthless