下面是一段青春励志宣言,请你仿照划线部分,将后面的句子补充完整。

青春的岁月不会一帆风顺。或许青春的道路常遇荆棘,但我们有足够的信心开拓自己的人生之路；或许青春的天空时有阴霾,但我们有足够的勇气追求自己的一片蓝天；或许青春的____,但我们____。

参与过敏反应的是（　　）

计算：4x²y÷（﹣$\frac{1}{4}x$）=____ ．

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.