I lived with my sister this summer and didn’t have to pay rent. So I _____ save most of my salary.
#90059
A
could
B
would
C
was able to
D
should
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Something ___ to save our earth. Do you think so?
#88938
A
can do
B
must do
C
has to do
D
must be done
But for the heavy traffic, the police ___ the thieves who tried to escape in the stolen car. 
#87591
A
would not catch
B
couldn’t have caught
C
haven’t caught
D
couldn’t catch