The water in the river isn't____ (harm). You can drink it without cooking.
“故”字共____笔，偏旁是____，组词____。
生物学知识与我们的生活密切相关．请你根据所学的知识解答：
When you decide to start a family，you make a/an________to them.You don't turn your back on the people who love you.
