Poll: Which is incorrect?

Which is incorrect?

I don't know which to buy.
I don't know what to say.
I don't know why to try.
I don't know who to ask.
I don't know where to go.

Comments:

mannuel

i have lot of time to study and know what are the proper things to do in any words ....

Chuck Newman

Should it not be "I don't know WHOM to ask"?

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