根据句意,用括号中所给词的适当形式填空
1. Tom is very strong and 90 kilos. (weigh)
2. In the beautiful garden, the old lady planted many . (rose)
3. African elephants are the biggest animals on, right? (land)
4. Our teachers always tell us that knowledge (知识) will give us to fly high. (wing)
5. Some animals like snakes and sleep through the cold winter. (frog)
6. These are very tall trees. They have yellow . (leaf)
7. It was the first time I travelled in an country. (Africa)
8. Autumn is the season among the four seasons. (colourful)
9. Some colourful are flying around the flowers in the garden. (butterfly)

1. weighs
2. roses
3. land
4. wings
5. frogs
6. leaves
7. African
8. most colourful
9. butterflies

1. 句子缺少谓语动词，根据句意应使用一般现在时，主语Tom为第三人称单数，因此动词weigh需用第三人称单数形式，即weighs。
2. many后接可数名词复数形式，rose的复数形式为roses。
3. on land为固定短语，表示在陆地上，land为不可数名词，用原形。
4. wing是可数名词，根据句意“知识将给我们高飞的翅膀”可知，翅膀一般是成对的，应用复数形式wings。
5. and连接并列成分，snakes为复数形式，frog的复数形式为frogs。
6. 树叶为可数名词，此处应为复数形式，leaf的复数为leaves。
7. country为名词，前面应用形容词修饰，Africa的形容词形式为African。
8. 前面有定冠词the，根据句意“秋天是四季中最色彩缤纷的季节”可知，应用最高级，colourful的最高级为most colourful。
9. some后接可数名词复数形式或不可数名词，butterfly为可数名词，应用复数形式butterflies。

Trees are everywhere around us. They help us and our environment in many ways. Let's take a look.
● They help us breathe.
1. A leafy tree produces as much oxygen in a season as ten people take in a year.
● They keep the earth cool.
Trees can beat the heat by taking in carbon dioxide that causes global warming.
● 2.
Tree roots help to absorb (吸收) water during floods (洪水). They can slow the water flow.
● They store water.
Forests are like sponges (海绵), catching rainfall. 3. Water can be stored there.
● They keep dirt in its place.
A forest's roots can hold soil together. In this way, the soil cannot be moved by wind or water.
● They clean up dirty air.
There are many pollutants (污染物) in the air. 4.
● They give us medicines (药物).
5. For example, ginkgo leaves are good for our lungs.
● They help us relax and explore.
Spending time in forests can help us calm down, as well as make us more creative.
A. They fight floods.
B. Trees help clean the sky.
C. They control noise pollution.
D. Then, water goes down into soil.
E. Forests provide a wealth of natural medicines.
F. Trees make oxygen and take in carbon dioxide.
G. Trees can store harmful pollutants or change the pollutants into less harmful forms.

1. F
2. A
3. D
4. G
5. E