Use your head; nothing taught by others can have the same effect on you as ___ is learned by yourself．
A．something B．that C．what D．it
---Excuse me, but I want to use your computer to type a report．
---You _____ have my computer if you don’t take care of it．
A．might not B．needn’t C．shouldn’t D．shan’t
_______ he is not perfect, she loves him．
A．Unless B．Since C．While D．Because
There still ______ some doubt whether the government can deal with the economic crisis successfully．
A．exist B．existing C．is existing D．exists
I can’t thank you ____ much because without your help I ______ have won the first prize．
A．too; wouldn’t B．very; shouldn’t
C．that; might not D．so; couldn’t
---How long have you been friends?
--- Well, our friendship ______ childhood．
A．is dated from B．dates back to
C．starts from D．dated from
