用Book 3 Unit1-5的单词或短语的正确形式填空。
1. We are not ____________(允许) to swim in the river. It’s too dangerous.
2. They wrote a letter and ____________（道歉）to their neighbors for their noise.
3. Air pollution will get worse and this will be __________(有害的) to people.
4. ____________(显而易见地), fishing forms an actual part of their leisure time.
5. Having a ____________(平衡的) diet is of great importance, especially for teens who are growing up.
6. In fact, music education is ____________(有益的) and important for all students.
7. Columbus Day is meant to celebrate the ___________(到达) of Christopher Columbus.
8. ____________(围绕) by mountains and the Pacific Ocean, Vancouver is said to be the most beautiful city in Canada.
9. There was frost on the ground, ___________(证明) that autumn had arrived in Canada.
10. Children’s____________(好奇心)with everything plays an important part in their study.
11. This museum was built ____________(为……纪念) the great writer-Lu Xun.
12. Born into a family with three brothers, David ____________(培养，教育) to value the sense of sharing.
13. They’d like to see their daughter____________(安定下来), get married and have kids.
14. This car industry is thinking of ______________(削减) production because of the COVID-19 pandemic.
15. __________(当心) cars when you cross the road.