句型转换。 小题1:The boy has been to the U.S.A. twice .(对画线部分提问) How ___________ ___________ has the boy been to the U.S.A.? 小题2:Mom felt tired after she cooked for the whole family.(改为简单句) Mom felt tired after ___________ for the whole family. 小题3:Mr. Brown and his wife have been married for 20 years. (改为同义句) Mr. Brown and his wife ___________ ___________ 20 years ago. 小题4:Lisa didn’t hang out with her friends yesterday. (改为肯定句) Lisa ___________ out with her friends yesterday. 小题5:Some reporters are interviewing a government official on traffic problems now.(改为被动语态) A government official is _________ _________ by some reporters on traffic problems now.