Does the one who starts to pray Taraweeh have to complete it?

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Uttering the intention out loud for salaat al-Taraaweeh and other prayers is bid’ah
Is the du’aa’ of Witr obligatory, and what should a person say if he cannot memorize it?

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There is no sound report to indicate that in Ramadan the Prophet (blessings and peace of Allah be upon him) prayed twenty rak‘ahs, even though that is permissible
He cannot pray Taraaweeh in the mosque because he is busy looking after his daughter
He does not pray in congregation because of his work
Uttering the intention out loud for salaat al-Taraaweeh and other prayers is bid’ah
Is the du’aa’ of Witr obligatory, and what should a person say if he cannot memorize it?

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