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Put in the proper form of the verbs: read, see,be,build,buy

1.I  have never ...... to Paris.
2.Nick has already ....... the book
3.We  haven't ........... the Tower of London  yet
4.Have they ........  their country house yet?
5.You  haven't ........... a present yet, have you?
6.She has already ......my cousin 

1.I  have never  been to Paris.2.Nick has already  read the book 3.We  haven't  seen the Tower of London  yet4.Have they built  their country house yet?5.You  haven't bought  a present yet, have you?6.She has already  seen my cousin