1 . 根据句意，选择短语并以其适当形式填空。

1. As garbage classification is significant, we should take an active part in __________.
2. __________ your efforts and devotion, I'm firmly convinced that we will win the battle and overcome the hard time.
3. __________ the Eastern Han Dynasty, paper cutting is one of the most popular traditional folk arts.
4. There is no denying the fact that more and more people choose to study abroad after graduation, __________ many hardships and difficulties.
5. There are several factors __________ their extravagant spending habits.
6. We can post inspiring words on social media to convey our confidence to __________ tough times together.
7. A staff from the gas station nearby got hold of the fire extinguisher and __________ the fire immediately.
8. It is really an appealing masterpiece, narrating many adventurous stories, which __________ the Tang Dynasty.
9. In addition, when we go shopping, we can take recycled bags instead of using plastic bags, which are a main source of pollution because they are hard to __________.
10. Because it is commonly believed that choosing courses at students’will means less time and effort are spent on their required courses, which directly __________ their failing grades.