Homework_________, we went home happily.
A. be finished
B. finishing
C. having finished
D. having been finished
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Much time_______ sitting at a desk , office workers are generally troubled by health problems.
A. spend
B. spent
C. spends
D. being spent
_________in painting, John didn't notice evening approaching.
A. To absorb
B. Absorbs
C. Absorbed
D. Absorbing
________for two days, Steve managed to finish his reports on schedule.
A. Having worked
B. Worked
C. To work
D. Being worked
Like ancient sailors, birds can find their way______ the sun and the stars.
A. Being used
B. to use
C. used
D. using