I don’t know if the pain.ting is authentic

I don’t know where the key is, but I suppose I ____________it at home.A. could have left

Don’t（) to let me know if there is anything I can do for you.

I don’t know the origin of this custom.

I don’t know the origin of this custom.

I don’t know if the pain.ting is authentic

I don’t know the 【origin】 of this custom.A.nature