he manager of the factory wants to improve production a great deal, but he doesn’t spend much on technology.—I am afraid he won’t realize his dream. You know ________.

What is he going to ________ when he _______ up— He’s going to be a doctor.

在下面一段话空缺处依次填入词语，最恰当的一组是（ ）人类基因组计划的雄心太大， 自然科牵的“双刃剑”性质，在它带给人类带来好处的同时，我们也不得不考虑，这些信息落在生物恐怖主义者或其他人类公敌手里怎么办 “人类基因组计划完成之日，就是人类自己灭亡之时”， 这种说法虽然太极端，但绝不是 ，人类至今安全的原因之一，就是它的 还不为人所知！

You can hardly imagine the difficulty the woman had ________ her children.

I returned home right away _________ I received my mother’s call.