短语讲解：

1.And now, as he looked at the shining face of the great clock, his smile changed.

look at 看; 审视; 评判
例句：He expected the girl to look at him in blank astonishment.
他以为那女店员又会瞠目结舌茫然以对。

2.They were always in a hurry, and always afraid, because of time.

because of 因为
例句：He is feeling wretched today because of the rain.
因为下雨，他今天情绪很不好。