Answer: environmental discomfort, and climate change possibly are two good challenges he will face in his next chapter of life
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I think it is C, because if I'm right present principal is something that is happening presently? If so, C would be the answer because they "are doing" the exercises right now in context.
        
             
        
        
        
Answer:  B; You must be careful when you look at the dark side.
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Answer:
To spend on food, clothes… to make our life
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1. Laced
2. I believe Dogs but it might be Water too
3.Ever
4.Always