Past Simple vs Present Perfect

Decide whether the Past Simple or Present Perfect Simple should be used in each gap.

______ you ____ (vote) in the last presidential election (in August)?  
Shannon ______ (go) to the cinema three times this week.  
Mike ________ (study) English grammar until the day he died.

__________ you ______ (think) about my offer yet?

He _______ (never; see) Africa. He died 20 years ago.  


He _______ (never; see) Africa. But he will, I guess!