【推荐1】However, a diet that is too high in animal protein can ________ (actual) lead to weight gain over time. (所给词的适当形式填空)

【推荐2】A good neighbor is also one who likes to help__________ in small ways. If a neighbor is going to be out of town, offer to collect mail and newspapers. （用适当的词填空）

【推荐3】_________(essential), everyone has two ages: a chronological(按时间计算的)age, and a biological age. (所给词的适当形式填空)