— What’s that terrible noise.David? — Oh,I forgot to tell you.The new machines in the nearby plant _______.
The warmth of___sweater will of course be determined by the sort of___wool used.
Paper money was in___use in China when Marco Polo visited the country in___thirteenth century.
Professor White has written some short stories, but he is___known for his plays.
—— Have you seen___pen? I left it here this morning. —— Is it___black one? I think I saw it somewhere.
How beautifully she sings! I have never heard____.