Choose the letter A, B, C, or D to indicate the sentence that best combines the following pair of sentences.

Our family supported us a lot. Otherwise, our project couldn’t have succeeded.

A. extinct

B. extinction

C. disappeared

D. disappearing

A. growth

B. speed

C. problem

D. pollution

A. If you don’t call the environmental group’s hotline, you can’t have further information.

B. Should you need further information, call the environmental group’s hotline.

C. If you called their hotline, the environmental group could give you further information.

D. Unless you called the environmental group’s hotline, you wouldn’t get further information.

A. To solve the lack of energy sources, we should switch to alternative energy.

B. One solution to alternative energy problems is to solve the lack of energy sources.

C. Alternative energy can be solved by the lack of energy sources.

D. Not using alternative energy can solve the lack of energy sources.

A. I think you should accept that generous offer.

B. You shouldn’t have accepted that generous offer.

C. It is unnecessary for you to accept that offer.

D. You can’t accept that generous offer.

A. If Rosie didn’t have enough money, she couldn’t buy a new laptop.

B. If Rosie has enough money, she can buy a new laptop.

C. If Rosie doesn’t have enough money, she can’t buy a new laptop.

D. If Rosie had enough money, she could buy a new laptop.