专心: concentrate one's attention，attentive，be absorbed，whole-hearted代替: take the place of, substitite for, instead of当志愿者: be/become a volunteer机会：chance，opportunity，occasion，probability困倦：sleepy，drowsy，tired傻气的：foolish自愿：voluntarily，willing严格：strict借：borrow，lend成功：success，succeed，come through执照：license
佛罗妮曲奇饼
