______ at the top of the Oriental Tower, people below will look very small.
#67600
A
Stand
B
Standing
C
To stand
D
If you stand
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We won’t give up ______ we should fail 10 times.
#67611
A
as if
B
except for
C
in case
D
even if
While we _________, we saw a UFO land on a street. 
#41211
A
were shopping
B
shopped
C
are shopping
D
shop