Ⅱ Write the words in right forms according to the requirements.
1. amaze (形容词) 2. protect (名词)
3. reach (第三人称单数) 4. solve (名词)
5. explore (名词) 6. freeze (形容词)
7. pollute (名词) 8. harm (形容词)
9. appear (反义词) 10. begin (现在分词)

amazing
protection
reaches
solution
exploration
freezing
pollution
harmful
disappear
beginning

Ⅲ Complete the sentences with proper words.
1. Riding bikes doesn’t cause (引起) air .
2. The school the students with textbooks.
3. Paper easily, so we should keep it away from fire.
4. The weather is hot, but the farmers work hard in their .
5. Food gives people a lot of .
6. It is to protect the Earth for our future.
7. The statue is almost 3 metres in .
8. The river is 1,389 long.
9. A cat a mouse easily.
10. There are two difficult maths .

pollution
provides
burns
fields
energy
important
height
kilometers
catches
problems