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4.It is the gold diamond.I spent all my money on it.
5.The old Olympic Games could date back to 776 BC.The modern games come from it.
6.The house is 7 kilometers away.Iwas born in it.
7.The letter is from my uncle.I received it yesterday.
4.It is the gold diamond (on)which I spent all my money on.
5.The old Olympic Games which the modern games come from could date back to 776 BC.
6.The house (in) which I was born is 7 kilometers away.
7.The letter is from my uncle which I received yesterday.