1. Let's go bike (ride). It's good for us.

1. 你什么时候意识到它是有害的?

1. 他为父母感到自豪。不久前他们志愿参加了抗击新冠病毒的战役。

He is his parents. Both of them volunteered to in the battle against COVID-19 not long ago.

1. 他没有生气，反而看起来挺高兴。

being annoyed, he seemed quite pleased.

1. We can clearly see the fish swimming at the / 'bɒtəm/ of the river.

1. We should set new l , open more national parks, plant more trees and stop pollution.

1. The fewer p bags we use, the less pollution we will have.

1. My father told me he used (木制的) blackboards in the past.

1. 完形填空

For thousands of years, people farmed the land. They grew fruit and vegetables. They hunted and fished for meat. They1cloth, dyes (染料) and paper from plants. They used stone and metal for weapons and tools.

People progressed to making machines powered2water and steam(蒸汽), and even later, by coal, oil, and petrol. Large cities were built. Factories3of machines created jobs in the cities for thousands of people. The Industrial Revolution(工业革命) changed the lives of many people because, for the first time, more people lived in cities rather than on4.

Companies built power plants (工厂) to make5to run the machines, factories and cities.

People did not realize these activities were6the Earth. They didn't realize how7oil, gas, coal and minerals were being used up.8cities grew bigger and spread across the land, plants and animals began to disappear. Their nature homes were destroyed (破坏) as people moved into new places.

As time passed, people began to 9 the need to protect the Earth and its natural resources(资源). People saw that plants and animals needed protection so that they wouldn't disappear forever. People joined together to tell10 around the world to conserve(节约) our natural resources and care for the Earth. And so, Earth Day was born. Each year more and more people take part in Earth Day. What can you do to help?

1. 我们必须采取行动来节约水。

We must to save water.