Windpower is used _______ electricity.
A. to produce
B. to be producing
C. to be produced
D. to producing
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Without your help , I _________ unable to succeed.
A. would be
B. would have been
C. will have been
D. am
We are quite ____________ to our parents and our teachers.
A. respectable
B. respectful
C. respective
D. respected
Would you mind _________ the window?
A. we opening
B. us opening
C. ours opening
D. we are opening
The boy really __________ his mother.
A. takes for
B. takes after
C. takes in
D. takes off