It's really time I went home but I'm enjoying myself, so I ________ here a bit longer.
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A
am staying
B
have stayed
C
stayed
D
stay
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New medicines and instruments ______ every day to extend life.
#105334
A
develop
B
are being developed
C
are developing
D
have developed
一Have you handed in your schoolwork yet?一Yes,I have.I guess it _____ now.
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A
has graded
B
is graded
C
is being graded
D
is grading
7.Although the causes of cancer ____, we do not yet have any practical way to prevent it.  
#105343
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered