Joining two sentences, using the words in brackets. 6. The climate is changing. The earth is getting warmer. (BECAUSE) ____________________________________________________________________ 7. We should stop cutting down so many trees. We endanger our oxygen supply. (UNLESS) ____________________________________________________________________ 8. People begin to recycle. They generate much less trash. (WHEN) ____________________________________________________________________ 9. We are damaging the ozone layer. The ozone layer is necessary for human existence.(EVEN THOUGH) ____________________________________________________________________ 10. Sue is suffering from skin cancer. She was exposed to radiation when she was young. (SO) ____________________________________________________________________

6. The climate is changing. The earth is getting warmer

-> Because the climate is changing, the earth is getting warmer

Because S + V, S + V : Bởi vì 

7. We should stop cutting down so many trees. We endanger our oxygen supply

-> Unless we stop cutting down so many trees, we won't endanger our oxygen supply

Unless = If not + Trừ khi 

8. People begin to recycle. They generate much less trash

-> When people begin to recycle, they generate much less trash

When = Khi 

9. We are damaging the ozone layer. The ozone layer is necessary for human existence

-> We are damaging the ozone layer even though it is necessary for human existence

Even though = Although = mặc dù

Even though S + V, S + V

10. Sue is suffering from skin cancer. She was exposed to radiation when she was young

-> Sue was exposed to radiation when she was young so she is suffering from skin cancer

so = vì thế 

S + V so S + V