Question I. Rewrite the sentences so that it has similar meaning to the first.

1.=>He said that they were doing an experiment.

2.=>She told me to sign the paper again.

3.=>Because of the dangerous acid rain, trees, leaves are damaged.

4.=>This house was built yesterday.

5.=>He asked if I went for a walk everyday.

Question II. Write a paragraph about ( 80-100 words )about causes and effects of water pollution.

Water pollution is the phenomenon of water bodies such as rivers, lakes, seas, underground water ... is the activities of the natural environment and humans to check for harmful substances such as substances found in protective plants, industrial substances. unresolved ty, ... all can give up the bad people and the life of things in natural. 

Water pollution is of natural origin: due to rain, snow melt, wind storms, floods, dirty wastes, harmful organisms including their dead bodies are released into the water environment. Water pollution of man-made origin: the process of discharging toxic substances mainly in liquid form such as domestic, industrial, agricultural, and traffic wastes into the water environment. Water pollution due to population growth. Water pollution due to domestic waste.Water pollution from medical waste.

Need to raise people's awareness of using and treating waste.Completing the wastewater treatment system in residential areas and even industrial zones.Using solutions to treat polluted water .

1.They are doing an experiment

->He said that they were doing an experiment

2.You have to sign the paper again

->She told me to sign the paper again

3.Acid rain is dangerous. Trees’ leaves are damaged( because of)

->Because of the dangerous acid rain, trees' leaves are damaged.
4.They built this house yesterday

->This house was built yesterday

5. “Do you go for a walk every day ? ”He asked me

->He asked if I went for a walk everyday

Question II.

Water Pollution is the contamination of water bodies. It occurs as a result of introduction of pollutants in water. Water is life. Still, we contribute in polluting the water bodies in several ways.Water Pollution is mainly caused as a result of improper discharge of household and industrial chemicals wastes into the water bodies.These dangerous chemicals (in the form of solid, liquid or gases) mixes with water and make it unsafe for living bodies. Water pollutants cause harm to human-beings, animals, trees and other constituents of environment. To solve the problems, there should be proper waste disposal system and waste should be treated before entering in to river. Educational and awareness programs should be organized to control the pollution