按要求变换下列句型。

1. They have ever been to an English-speaking country.　　(一般疑问句) 

______________ they ever ______________ to an English-speaking country .

2. She has been a flight attendant for two years. 　　　　　(对划线部分提问)

_______________________ she ________________ a flight attendant.

3. His father has been to America twice. 　　　　　　　　(对划线部分提问)

_______________________ has his father __________________ to America?

4. Linda is taller than any other girl in her class. ( 同义句)

Linda is __________________________ girl in her class.

5. improve , why , you , do , English , want , to , your  (连词成句)

______________________________________________________________?