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(1) My mother gets up the earliest in my family.
→ It's my mother who gets up the earliest in my family.

(2) I saw Ms. Ito, our math teacher, at the bookstore.
→ It was Ms. Ito, our math teacher, whom/who/that I saw at the bookstore.

(3) She was given a handkerchief by Jim three days ago.
→ It was three days ago that she was given a handkerchief by Jim.

(4) I put my watch on this table last night.
→ It was on this table that I put my watch last night.

if I'm not mistaken.

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