运动和健康饮食减少患心脏病的几率。

Exercise and a healthy diet ___lessen the chance of heart disease.

加强腿部力量，它减轻膝盖的压力。

Strengthen the legs and it ___lessens the strain on the knees.

如果您退还学生的钱并考虑我们的投诉，我相信您会减轻我们的失望。

Should you give back the students' money and take into consideration our complaints, I am sure that you will ___lessen our disappointment.