观察下列课文原句并回答问题
1. There comes a time when the old must give way to the new, and it is not possible to preserve everything from our past as we move towards the future.
2. Water from the dam would likely damage a number of temples and destroy cultural relics that(which) were an important part of Egypt ’s cultural heritage.
3. After listening to the scientists who(that) had studied the problem, and citizens who(that) lived near the dam, the government turned to the United Nations for help in 1959.
4. Temples and other cultural sites were taken down piece by piece, and then moved and put back together again in a place where they were safe from the water.
5. Not only had the countries found a path to the future that(which) did not run over the relics of the past, but they had also learnt that it was possible for countries to work together to build a better tomorrow.
