The monument was built in honor of the explorer who was believed _____ the river.
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A
to have discovered   
B
to have been discovered
C
to discover  
D
having been discovered
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 There were lots of people _____, and not one of them offered to help. 
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A
standing watching
B
standing to watch
C
stood watching
D
stood to watch
Fans crowded the street outside, ______ a look at their hero.
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A
waiting for
B
waited for
C
to wait for
D
to be waiting for