There are no lights in any of the classrooms. ____ it is very dark for the pupils to read and write. There are not enough desks or chairs. ____ some students have to sit on the floor during the lessons. You will fail the test ____ you work hard. Sara won't have any friends ____ she is nice to her classmates. Some people leave the tap on when they brush their teeth. ____ they waste a lot of water. Environmental problems will get worse ____ we change our habits. Hunters kill tigers for their skins. ____ there are not many tigers left in the wild.

Therefore / unless

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