句型转换。

1. Mary was able to find the way back home. (改为否定句)

    Mary _______  _______ to find the way back home.

2. I don't know what I should do. (改为同义句)

    I don't know what _______  ________.

3. It took them ten days to finish the work. (对画线部分提问)

    _______  ________ did it take them to finish the work?

4. I'd like to buy some tickets to the wonderful concert. (改为一般疑问句) 

                  you like to buy                tickets to the wonderful concert?

5. The book is too expensive for me to buy. (改为同义句)

    The book is               expensive               I can't buy it.