Look 补充说明1.Mrs.green said to her son,"please help ____do ___

Look 补充说明
1.Mrs.green said to her son,"please help ____do ____ housework."
2.The children finished the work all by____
3.He____ wrote the letter to me,even though he was too busy.
4.The little girl is young,but she can take care of____.
5.I will repair the bike by____.
6.Tom is my boryher.____ often helps me and I often help____.