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Please pardon my english as it is not my primary language. Below are some sentences that i have wrote. Those sentences in bold are those that i think are correct. Please help to indentify the correct sentences. Thanks in advance.

He told me yesterday that he wants me to get him a tie.

He told me yesterday that he wanted me to get him a tie.

He wants me to get him a tie.

He wanted me to get him a tie.

I went there yesterday, and the price is $50.

I went there yesterday, and the price was $50.

He asked me whether it is possible to terminate his account.

He asked me whether it was possible to terminate his account.

He asked me whether I am going to the party.

He asked me whether I was going to the party.
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He told me yesterday that he wants me to get him a tie. OK.

He told me yesterday that he wanted me to get him a tie. OK.

He wants me to get him a tie. OK.
He wanted me to get him a tie. OK.

I went there yesterday, and the price is $50. OK.
I went there yesterday, and the price was $50. OK.

He asked me whether it is possible to terminate his account. OK.
He asked me whether it was possible to terminate his account. OK.

He asked me whether I am going to the party. OK.
He asked me whether I was going to the party. OK.
______________

They are all correct. Use the second of each pair if the point of the exercise is to choose the ones with backshifts.
CJ
Comments  
Could anyone help?
 CalifJim's reply was promoted to an answer.