look after,look for ,look out .应该怎么填

look after,look for ,look out .应该怎么填
look after,look for ,look out ,look over ,look up ,look into
1.________your exercise before you hand them in.
2.He promised to ________ the matter .
3.Who will ________ the children while we are away?
4.I'm ________ my brother.Have you seen him
5.________!There 's danger ahead.
6.________it ________ in the dictionary if you don't know a word
我是要怎么填这些词进去
而不是意思