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

The earthquake destroyed the town. They spent many months rebuilding the area.

A. Functions of a public library

B. What a public library focuses on

C. What services a public library offers

D. How to obtain a public library card

A. that

B. what

C. which

D. when

A. A subway system was developed in order to improve the transportation in the city.

B. We developed a subway system which was improved by the transportation in the city.

C. A subway system was developed, so the transportation in the city needed improving.

D. The transportation in the city would be improved if we developed a subway system.

A. You can wear a swimming cap in the pool if you want.

B. You should not wear a swimming cap in the pool.

C. Wearing a swimming cap in the pool is optional.

D. Swimming caps must be worn in the pool.

A. Members have to use all the facilities in the center.

B. Members should be allowed to use all the facilities.

C. Facilities must be used by only members.

D. The center should develop its facilities.

A. Visitors can try wearing protective clothing.

B. Under no circumstances should visitors take off their protective clothing.

C. Protective clothing must be paid for by visitors.

D. Visitors must on no condition put on protective clothing.