英语按要求改句（难题）

英语按要求改句（难题）
1.He will measure the big tre with this rope.The little boy said.(合并一句）
The little boy said he _____measure the big tre with ___rope
2.This is no fish in this river because it has been polluted(保持原句）
This is no fish in this river because ____ ____ ____
3.We don't know when to start.(改为复合句）
We don't know when ___ ___ start
4.Mother Teresa awarded Nobel Peace Prize in 1979
Mother Teresa _____a Nobel Peace Prize in 1979

The boy said he would measure the big tree with the/that rope.
There is no fish in this river because of its pollution.
We don't know when we should start.
Mother Teresa won a Nobel Peace Prize in 1979.