用介词+关系代词引导的定语从句改写下列句子
1 The old house where Nick used to live was burnt down during the fire last week.
2 The reason why he was late for his class is that he got up late this morning.
3 The bamboo grows best at the place where there is enough rain and water.
4 We paid a visit to Beijing University last week where I spent four happy happy years.
5 The film reminded me of the hard times when we had nothing to eat.