1．________ the Internet is of great help, I don't think it's a good idea to spend too much time on it.
A．If B．While
C．Because D．As
解析：选B。考查连词。句意：尽管因特网是很有帮助的， 但我认为在网络上花费太多的时间不是个好主意。while引导让步状语从句， 意为 “尽管”。
2．Maybe if I ________ science, and not literature then, I would be able to give you more help.
A．studied B．would study
C．had studied D．was studying
解析：选 C。虚拟语气。句意：或许当初我要是学了理科而不是文科，现在就能给你更多的帮助。then表示过去的时间，if引导的从句是对过去的虚拟，因此使用过去完成时。
