Man was, is and always will be trying to improve his living conditions.

I thought you might be tired, （） is why I decided to help you.

It is quite typical of him to be late.

All of them are （） at Lana"s achievement.

It"s no good learning English without practice.

No agreement was （） in the discussion as neither side would give way to the other.

我們認(rèn)為節(jié)約用水非常重要。

事實勝于雄辯。

It is when you nearly lose someone when you become fully conscious of how much you value them.

No one should blind himself （） the well-known fact.