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2) His works (are) (being) (sold) in an auction now.
3) Ms. Kato (was) (happy) (with) a surprise gift from her husband. ※be happy with … …に喜んでいる
4) (It) (is) (thought) (that) English is important in business. <形式主語構文>
参考にしてください。
You're welcome!😊
ありがとうございます