单项选择题Mathematics()study or science of numbers.

A.is 
B.are 
C.was 
D.were

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1Mary told me that she()to the supermarket before coming home

A.went  
B.had gone
C.has gone 
D.goes

2Many people watched the boys()the mountain at that time.

A.climb 
B.climbing
C.to climb
D.climbed

4Madam, do all the buses go downtown?()

A.Wow, you got the idea.
B.No, never mind.
C.Pretty well, I guess.
D.Sorry, I'm new here

5Look! Here()the famous player

A.comes
B.come 
C.had come  
D.coming