我们今天所见的互联网并非一蹴而就，而是随时间发展而来的。

The Internet as we see it today did not ___come ___into ___being all at once, but developed over time.

没有人怀疑这种情况的出现主要是由于医学和其他自然科学的极大进步，这种进步在一个世纪前就可以观察到，现在甚至更大了。

Nobody doubts that this situation could ___come ___into ___being mostly due to the extremely great progress of medicine and the other natural sciences that could be observed one century ago and which is even greater now.

新政党经过多年的基层活动后诞生了。

The new political party ___came ___into ___being after years of grassroots activism.