Exercise 1. Write S for simple sentences and C for compound sentences.

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5. Jack went to school late, for he got up late.
6. Tony works hard; therefore, he always gets a bonus.
7. Lisa uses social networks five hours a day.
8. You can choose the blue shirt or the green one.
9. The kids are talking to each other through video chat.
10. You should leave now; otherwise, you will miss the bus.