✏ 1). The article has been reviewed by the teacher many times.

• The article is being reviewed by the teacher many times.

✏ 2). The food was eaten by the cat.

• The food is being eaten by the cat.

✏ 3). The dirty river is cleaned by the concerned citizens.

• The dirty river is being cleaned by the concerned citizens.

✏ 4). The new vaccination program was announced by the mayor.

• The new vaccination program is being announced by the mayor.

✏ 5). The new policies had been prepared by the landlord.

• The new policies is being prepared by the landlord.

I hope it helps〃＾▽＾〃