Mother caught the boy _____ in the corner. 
#98253
A
smoke
B
to smoke
C
smoking
D
being smoked
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That year his total income, with his reward  _________, _________ 12 000 yuan.
#90848
A
added to; added up to
B
adds to; adds up to
C
added up to; added
D
added; added to
The professor explained this theory so clearly that this phenomenon was easy enough ________.
#95942
A
for us to work out
B
working out
C
for working out
D
to working out
He had to have the washing machine _________ last night.
#96133
A
to mend
B
mending
C
mended
D
being mended