根据中文或首字母在答卷纸上写出完整的单词。（每空1分，共10分）

I __1_ (相信)it’s very ___2__ (重要的)to have a healthy lifestyle. Usually I get up__3_(早),then I love to __4__(喝)a glass of milk. I  __5_(离开) home at 6:30. I never __6__(乘)a bus to go to school, I always walk there although it takes me about__7__(四十)minutes to go to school, I do morning exercise__8__(一次)a day. It helps me to study__9___.(更好)and I hardly ever have a __10__(感冒). I really enjoy my life.

优化群体质量的基本途径是（）