一、根据汉语意思写单词。
1. In geography classes, we learn about rivers, mountains and (海洋).
2. The forest is full of all kinds of animals, from (微小的) insects to large animals.
3. Mr Li is good at teaching. He always makes his class (生机勃勃的).
4. The (气候) here is hot and wet. It's good for some plants.
5. Last year, the farm grew and sold about 60 (吨) of vegetables.

1. oceans 2. tiny 3. lively 4. climate 5. tons

本题考查结合语境根据汉语提示拼写单词，需注意单词的形式变化：1. 句中并列的rivers、mountains均为可数名词复数，因此表示“海洋”的ocean要使用复数形式，和前后名词保持一致；2. 此处需要形容词修饰名词insects，填入表示“微小的”的形容词即可；3. 此处符合make sth.+形容词的结构，空格处填表示“生机勃勃的”的形容词作宾语补足语；4. 句中be动词为is，主语用表示“气候”的单数名词即可；5. 空前有数词60，可数名词“吨”需要使用复数形式。

二、用括号中所给单词的适当形式填空。
6. Music brings us (happy) and changes us a lot.
7. We felt (disappoint) because our team lost the football game.
8. With the (popular) of Sichuan opera, more and more people get to know Sichuan culture now.
9. We should take (act) right away to protect animals in danger.
10. The sudden (appear) of several policemen caused the robbers（盗贼）to drop the money and run.

6. happiness
7. disappointed
8. popularity
9. action
10. appearance

6. 句中动词bring可接双宾语，此处需要将形容词happy变为名词happiness，作bring的宾语，表达“快乐”的含义。
7. 感官系动词felt后需接形容词作表语，主语We指代人，要把动词disappoint变为形容词disappointed，意为“感到失望的”，用于描述人的感受。
8. 定冠词the后面需要接名词，此处将形容词popular变为名词popularity，构成常用结构with the popularity of...，表示“随着……的普及”。
9. 此处是固定搭配take action，意为“采取行动”，需要把动词act变为名词action。
10. 形容词sudden后需要接名词，此处将动词appear变为名词appearance，表达“出现”的含义。

三、选词填空。

How much do you know about frogs? Frogs play an important role
11. the ecosystem. We all know that frogs help to 12.
fields by eating insects. If there are no frogs, the number of insects will grow
13. , and it will be bad for plants and fields. Besides, frogs are also food
for other animals like birds and snakes. If there are fewer frogs, many other animals
will have 14. food than they need. Frogs can live both on land and in
water. They act as a bridge. 15. they are one of the main subjects in
studies on climate change and the ecosystem.
In fact, there is a close 16. between everything in nature. We can't
live our lives well without frogs. However, not everyone understands their
17. in nature. Some people 18. forests and take up
farmland. As a result, frogs are in danger. Let's take action to protect frogs, which
can help keep 19. planet healthy and beautiful. Next time you hear a
frog, remember—it's not just a sound; it's a sign of a healthy planet.

11. in
12. protect
13. quickly
14. less
15. So
16. connection
17. importance
18. cut down
19. our

本题考查八年级核心词汇的词形转换与固定搭配运用，逐空解析如下：
11. 固定搭配play an important role in 表示“在……中发挥重要作用”，填介词in。
12. 固定结构help to do sth. 后接动词原形，结合“青蛙吃害虫保护农田”的语境，填动词protect。
13. 此处修饰动词grow，需要将形容词quick变为副词quickly，意为“快速地”，表示昆虫的数量会快速增长。
14. 空后有than表比较含义，需要将little变为比较级less，意为“更少的”，表示其他动物能获取的食物会比它们所需的更少。
15. 此处承接前文的逻辑内容，表因果关系，句首首字母大写，填连词So，意为“所以”。
16. 空前有不定冠词a和形容词close，需要将动词connect变为名词connection，意为“联系”，表示自然界的万物之间存在紧密的联系。
17. 空前有形容词性物主代词their，需要将形容词important变为名词importance，意为“重要性”，表示并非所有人都了解青蛙在自然界的重要性。
18. 结合“砍伐森林”的语境，固定搭配cut down表示“砍伐”，主语为复数，用动词原形cut down。
19. 空后有名词planet，需要将人称代词we变为形容词性物主代词our，意为“我们的”，修饰名词planet。