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I am so tired now. It took us about 3 hours to     the top of the mountain.

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had; would    have; would    have; will    had; should  
have felt, run    have been feeling, am running    felt, run    feel, am running  
go    went    will go    am going  
too; open    so; closed    too; closed    so; open  
couldn’t have stayed up   mustn’t have stayed up   shouldn’t have stayed up   needn’t have stayed up  
besides   meanwhile   however   anyhow  
studied    had studied    am studying    have been studying  
So long as I am fond of    Now that I am fond of    Much as I am fond of her   As I am fond of very much  
I’m sorry to hear that.    Good idea    Me too   I want to sleep now  
Only if  If only  Only too  What if  
stay  to stay  staying  stayed  
So long as I am fond of    Now that I am fond of    Much as I am fond of her    As I am fond of very much  
to have    having    have    had  
I don’t care    So am I    It’s hard to say    I hope so  
I don't care  It's hard to say   So am I  I hope so  
now that    unless    so that    although  
I don’t care   It’s hard to say   so am I   I hope so  
so I am   so am I   so I do   so doI.  

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