改错：There was little which i could do for you.The person to w

There was little（ that ）i could do for you

The person to （whom） i spoke just now is my brother.
Most people can quickly get help from a doctor or go to a hospital （when） they are ill
Can you tell me the company （which）　 you visited last week?
Please pass me the book whose cover （is　） red.
I have a good friend （whose）name is Liu Mei

it was litttle that i could do for you.
the person to whom i spoke to just now is my broher.
...when they are ill.
...the company which you visited last week?
...the book whose cover is red.
...friend whose name is Liu Mei.