请做以下各组试题，注意其中有无and和but所导致所选答案的变化：

1. It ______ fine, we went out for a walk. (选C)

It ______ fine, and we went out for a walk.(选A)

A. was                     B. is                      C. being                  D. were

2. There I saw five people, the teacher _______.(选A)

There I saw five people, and the teacher _______.(选B)

A. included               B. was included      C. including             D. was including

3. He bought a lot of books, most of _______ are about agriculture.(选D)

He bought a lot of books, and most of _______ are about agriculture.(选A)

A. them                    B. books                C. his                      D. which

4. He wrote a lot of book, none of _______ were popular. (选D)

He wrote a lot of book, but none of _______ were popular.(选A)

A. them                    B. books                C. his                      D. which