Помогите пожалуйста Who works in this office?-My (mother/motgers'/mother's) friends...

Question

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Who works in this office?-My (mother/motgers'/mother's) friends (work/works/do).
Once there lived (a/an/the/-) old farmer.(The/A/An) farmer had (a/an/the/-)horses and (a/an/the/-)cows.
Tom is (a/an/the/-)little.(A/The/-)Tom' sister is (a/an/the/-) pupil.She is in (a/an/the/-) second form.
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Answer 1

Who works in this office?-My Mother's friends works.
Once there lived an old farmer.The farmer had horses and cows.
Tom is little.A Tom' sister is pupil.She is in the second form.