1. I was very happy because I received your letter this morning.
2.The factory is producing more and more pollution so we are afraid
3.I am sure that using unleaded petrol has a lot of advantages
4.They burned the plastic waste, it's not good.
5.He didn't pass the driving test, so he was very sad
6.He is delighted that you have paid attention to recycling.
7.he local authorities will investigate their company about treating waste because they are not pleased.
8.She is very glad because she becomes a member of the group '' Friend of the Earth''.
9.We were surprised that He won the first prize in the environmental protection contest
10.It was brave of him to jump into the river to save the child
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