He had never envied the rich___money.
Samuel was _____ why few of his friends attended his birthday party.
_____ life exists on any other planet in the solar system still remains a question.
Later, the naughty boys _____ to the English teacher for having played a trick on her the other day.
The company is deep in _____, so you’d better avoid dealing with it.
—I met your uncle on my way to school this morning.—Ah? You _____ be joking. He flew to Germany yesterday evening!