Because/ because of

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Because/ because of
1. Peter didn't go to school yesterday because he was sick.
→ Because of ..........
2. Mary went to bed early because she felt tired.
→ Because of ..........
3. She didn't go to the circus with Betty because she had a bad cold.
→ Because of ..........
4. John succeeded in his exam because he worked hard.
→ Because of ..........
5. She stayed at home because her mother was sick.
→ Because of ........