1.The twins are from the USA.(改为同义句）
The twins 【come from】 the USA.
2.I (walked) form the station to the office.(就括号部分提问）
【How do】 you come from the station to the office?
3.Mark likes playing badminton best.(改为同义句）
Mark's favourite【sport】 is 【playing】 badminton.
4.It's (6782 kilometers) from the city to out hometown.(就括号部分提问）
【How far】 is it from the city to our hometown?
5.She does her homework at home in the evening.(改为否定句）
She【doesn't do】 her homework at home in the evening.