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Tom is crazy about DIY model planes. His workshop is always in a mess.
If you want to get good grades in the exams, you have to pay attention to quite a few details.
When the earthquake happened, I saw people running in all directions in fear.
It's necessary for students to learn about the balance of natural ecosystems.
We all know that good study habits are closely connected with getting good grades.
       Our earth was healthy and beautiful in the past. However, it is 
facing a lot of serious problems now. The number of wild animals is 
getting smaller and smaller. What's worse, there are more and more 
natural disasters than before. Both people and animals are in great 
danger now. 
       Why does this happen? Firstly, people cut down too many trees. 
As a result, a lot of wild animals have nowhere to live or nothing to 
eat. Besides, there is too much pollution. 
       In order to improve the situation, we should take action right now. 
The government should make laws to prevent people from cutting 
down trees. Also, everybody should know the importance of 
protecting the environment.
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