Getting to the cinema, quite out of breath, we found the film     for ten minutes. 
#102720
A
having been on
B
had begun
C
had been on
D
had been started
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It is well known to us all that a lot of rivers _______by factories.
#102816
A
are polluting
B
have been polluting
C
are being polluting
D
are being polluted
Helen ______ her keys in the office so she had to wait until her husband ______ home. 
#102080
A
has left; comes
B
left; had come
C
had left; came
D
had left; would come