I have no answer of these at all.
对于这些,我也不知道答案。
No, not at all. Glad to have you.
不,一点也不。我很高兴和你在一起。
No, I have only this briefcase.
没有,我只有这只公文包。
I do not know every one of you.
我不认识你们中的每一个人。
I do not know why you like him.
我不知道,你为什么喜欢他。
How do I know what I should do, what not to do?
我怎么知道我应该做什么,不应该做什么呢?