Mrs. Brown is  a ____(Canada) teacher in a middle school. She t____English. She often helps her students ____ their study. Also, some ____(foreigner)children can talk with her ____(practice) English online.

    Li Yan, a girl from China learns much____Mrs. Brown. She is ____(excite) these days because she won first p____ in the English competition last week. She ____(real)improved a lot. When Mrs. Brown knew this, she was ____pride) of her. She believes Li Yan can do better. 

美国有个富翁，规定读小学五年级的儿子每周必须独立谋生一天。富翁亲自驾车几十公里，把孩子送到闹市区，赶下车，令其自己想办法谋生一天，傍晚他再驾车把儿子接回来……对这个富翁的做法，你的认识是（    ）

保护生物的多样性，最有效的措施是（ ）