①物种多样性    ②遗传多样性    ③生物多样性    ④生态系统多样性

根据句意，用所给动词的适当形式填空。
(1)By the time he left college, he ____ (get) much working experience because of his part-time job.
(2)John, like other children who have no parents,____  (take) good care of in our country.
(3)We should wash hands properly ____  (fight) against H7N9 virus.
(4)Look! There are so many kites____ (fly) in the sky.
(5)If you want to improve your English, you should practice____ (speak) it as much as possible in and out of class.

①教师是人类文明的主要传承者之一

②教师承担教书育人的使命

③在我们成长过程中发挥着不可替代的作用

④我们要尊重、欣赏和理解老师

中国科学院外籍院士杨振宁和姚期智已依照相关规定，正式转为                目前有754位，外籍院士78位。（    ）