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