Select the passive form of the given sentence.

The manager keeps the work pending.

The work is kept pending by the manager.

The correct passive form of the given sentence is The work is kept pending by the manager.

The active voice of the sentence is The manager keeps the work pending. This sentence is in the present simple tense, which is used to describe an action that happens regularly or always happens. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the present participle of the main verb. In this case, the subject of the active sentence is "the manager" and the main verb is "keep." The present participle of "keep" is "keeping." So, the passive form of the sentence is The work is kept pending by the manager.

The other options are incorrect because:

• The work has been kept pending by the manager. is in the present perfect tense, which is used to describe an action that has happened in the past but is still relevant to the present. The action of keeping the work pending is not something that is still relevant to the present.
• The work was kept pending by the manager. is in the past simple tense, while the original sentence is in the present simple tense.
• The work are being kept pending by the manager. is grammatically incorrect. The verb "are" is plural, but the subject of the sentence, "work," is singular.