Although many great people ever failed, they never _______ and tried to succeed.

Who ______ it be that is singing in the next room?— It _______ be Lucy, but I am not sure.

I wonder why Jack always gets good marks when he does only ________ the others.

It is every citizen’s duty to go out to______ the snow on the street______ it stops falling so as to make itconvenient for traffic to pass. .

I am sure our volleyball team will______theteam from No. Middle School.