The chairman thought _____ necessary to invite Professor Smith to speak at the meeting.
The lion is considered a(n) ____of courage and power, and the other animals see him as kings of the forest.
— Shall we go to see the snow sculptures(雕塑)? — _______.
Do ________ you think is right _________ difficulties you may have.
— I phoned you at about three this afternoon, but no one answered. — Oh, that was probably _______ I was doing exercise outdoors.
Everyone knows that ______ paper was invented by _______ Chinese.