1 . （2020年北京卷）Over time, the bags fall apart________ countless tiny pieces, and fish can accidentally eat some of them. (用适当的词填空)

2 . （2021年北京卷）While riding his bike home ________ a cold night, he came across a sad-looking elderly woman wandering the streets by herself.（用适当的词填空）

3 . (2020年北京卷)A piece of stone__________(find) on a Dutch beach suggests that our extinct human relatives, known as Neanderthals, were cleverer than previously thought. (所给词的适当形式填空)

4 . (2021年北京卷)Much of this increase can be due to climate change. The findings show a critical need ________ (invest) in disaster prevention. (所给词的适当形式填空)

5 . (2021年北京卷)From 2000 to 2019, there were 7, 348 major natural disasters around the world, ________(result) in USD 2,970 billion in economic loss．(所给词的适当形式填空)

6 . （2021北京卷）Why do we dream？Scientists aren’t completely sure, and they have diverse________ (idea)．（所给词的适当形式填空）

7 . The advantage of studying at home is: I don't have to catch public transport to school, _______ reduces the risk of infection. (用适当的词填空)

8 . It is by acting together, in this exciting way, that we can involve thousands– millions-of people, and this is _______ is going to change the world. (用适当的词填空)

9 . In a thousand years, archaeologists will be digging through the ________ of what was once the city of San Francisco. (ruin) (所给词的适当形式填空)

10 . When you sleep, your brain sorts through everything ________ happened during the day, trying to link new experiences to old memories. (用适当的词填空)