Do you know the man ________ is reading the book over there?——— Yes, he is Mr. Green, our P.E. teacher.

If there are _______ people driving, there will be _______ air pollution.—Yes, the air will be fresher.

Would you like to go _____ a picnic.—Yes, I’d love to.[ ]

When will the party begin?—When all the people invited .

He found ______ very helpful to memorize the words of some popular English songs.