依次填入下列各句横线处的成语，最恰当的一组是（ ）①他是一个心地善良的人，但性格优弱、谨小慎微，做起事来总是 ，从来不敢越雷池一步。②当今世界科技突飞猛进，我们更要勇于开拓，不断进取，如果 ，就会落后甚至被时代潮流所淘汰。③想让中国传统戏曲煥发出新的生命力，决不能满足于现状， ，唯有创新才是弘扬戏曲文化的康庄大道。

Little Tom ran all the way to school, getting there _____.[ ]

The local villager gave such a(n)______description that all the tourists felt as if they were right on the scene.

I was doing my homework _______ a dog came in.

Yesterday I downloaded a new program ________ the Internet. Now I can watch TV and movies _________ my computer.