1. The mistake has already been ------------------ by him.
A) correct B) correcting C) correction D) corrected

2. The family has ------------------ from their vacation already.
A) return B) returned C) been return D) been returned

3. They were seen ------------------ kites in the park last weekend.
A) fly B) flown C) flying D) to be flown

4. The manager was preoccupied ------------------ checking the reports.
A) in B) at C) with D) from