Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.

We cut down many forests. The Earth becomes hot.

A. Mai usually helps her classmates with their studies, but they appreciate her.

B. Mai usually helps her classmates with their studies, for they appreciate her.

C. Mai usually helps her classmates with their studies, so they appreciate her.

D. Mai usually helps her classmates with their studies, or they appreciate her.

A. You are tired of working so much.

B. You are tired because you are working so much.

C. If you work so much, you'll get tired.

D. You were tired because you have been working so much.

A. A new hospital is going to be built just outside of the town.

B. A new hospital is being gone to build just outside of the town.

C. A new hospital just outside of town has gone to be built.

D. A new hospital just outside of town has been gone to built.

A. I wish I wouldn't drink so much last night.

B. I wish I didn't drink so much last night.

C. I didn't drink so much last night.

D. If only I hadn't drunk so much last night.

A. I haven't seen him since my twenty-first birthday party.

B. I didn't see him since my twenty-first birthday party.

C. I haven't had a birthday party for twenty-one years.

D. I had twenty-once birthday parties.

A. In spite of being very busy with her work at the office, my mother takes good care of us.

B. Because my mother is very busy with her work at the office, she takes good care of us.

C. My mother is so busy with her work at the office that she cannot take good care of us.

D. My mother is too busy with her work at the office to take good care of us.

A. Would you mind not smoking inside the building?

B. Would you like to smoke outside the building?

C. People are allowed to smoke in this building.

D. People don't smoke in this building.