1.It is not easy to work out the problem.(改为同义句) To work out

1.It is not easy to work out the problem.(改为同义句) To work out the problem____ ____ ____.
2.I wrote down his terephone number.I want to remember his telephone number.(合并为一句）
I wrote down his telephone number____ ____ ____.
3.We should try our best to save as many animals as we can.(改为同义句）
We should try our best to save ___ ___ animals ___ ___ .
4.Our English teacher asked us to translate every word.(改为否定句）
Our English teacher asked us ___ ___ ___every word.
5.We started early to get to the airport in time.(对划线部分提问）
____ ____ you start early?