1. Scientists have many theories about how the universe first came into existence.
2. Some of my relations live in America.
3. Our tour guides will be pleased to be of assistance if you have any problems.
4. Foreign friends are invited to invest in the local touring project.
5. After many matches, the team still maintains(保持)its first place.
6. There are many prehistoric remains(遗迹)in China.
7. It was proposed(建议) that we should have a meeting at once.
8. Environmental awareness(意识)has increased over the years.
9. He bought a precious(宝贵的)diamond necklace for his wife.
10. The calm courage of the pilot preserved(保护)the lives of the passengers.
