回答

① the ancient Egyptians ※They=複数形 → 前文を見ると 1. the ancient Egyptians と 2. many gods が複数形 → 意味から1.
② the ancient Egyptians ※They=複数形 → 前文を見ると 1. the ancient Egyptians と 2. many gods が複数形 → 意味から1.
③ the ancient Egyptians ※前文 They also believed … → They は同じ → the ancient Egyptians
④ the ancient Egyptians
⑤ the pharaoh ※he or she=単数形 → 前を見ると the pharaoh(単数形)
⑥ They believed that the pharaoh could help them even after he or she died 
※Because of this = Because they believed that pharaoh could help them even after he or she died
⑦ the ancient Egyptians
⑧ the pharaoh
⑨ to preserve his or her body
⑩ to preserve his or her body

以上、参考にしてください。

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