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Answer:
yes
Explanation: everytime i learn something new i become more and more confidant in what i am doing beacuse i am learning and developing new skills
There are many reasons why Zachary can't concentrate. He might have something on his mind that is bothering him, he could be hungry, he could not have a lot of energy. The best thing Zachary could do to help the paper not suffer is leave his desk and paper alone for about a half an hour, and maybe eat something, or just take a break. Maybe take a nap to get some energy back up so that he can get everything he needs in his paper.
Strenuous would fit in the blank
I am sorry, but this question is in the wrong category. I understand how you may have misunderstood this, but please move your question elsewhere.