Write each pair of sentences as a compound sentence, using the conjunction in parentheses. Place a comma where it is needed.

1. Spring came. The birds flew north. (and)


2. I can hand in a written report on spiders. I can give an oral report. (or)


3. They had been working very hard. They did not seem especially tired. (but)


4. Usually we study in the morning. We go swimming in the afternoon. (and)