句型转换。
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.?
Mom felt tired after she cooked for the whole family.（改为简单句）
Mom felt tired after ___________ for the whole family.
Mr. Brown and his wife have been married for 20 years. （改为同义句）
Mr. Brown and his wife ___________ ___________ 20 years ago.
Lisa didn’t hang out with her friends yesterday. （改为肯定句）
Lisa ___________ out with her friends yesterday.
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.