第81句：

I spent a whole week searching on the net,but came up with nothing valuable.

六級詞匯講解:
該句中的search on the net意為“在互聯網上搜索”。其他與網絡有關的表達還有:surfon the Internet(上網，網上沖浪)、online game(網絡游戲)、online community (網絡社區)、netizen(網民)、netterlnettie/nethead(網蟲，網迷)、netuews(網絡新聞)等。come up with意為“提出;想出”，相當于think up。

六級考點歸納：
come up的用法歸納。
1. comp up with意為“提出;想出”。如:
1)The scientists are beating their brains trying to come up with a solution to the problem.
科學家正絞盡腦汁，力求找到解決此問題的辦法。
2)No one has come up with a convincing explanation of why dinosaurs die out.
尚未有人能對恐龍滅絕的原因作出一個令人信服的解釋。

2. come up with還有“趕上”的意思。如:
We shall have to work hard to come up with them.
我們得努力工作，趕上他們。