Choose the correct option to fill in the blanks in the sentence:-

Flights kept ____ because of bad weather.

being delayed

The correct answer is Option (2) → being delayed

The verb keep (meaning to continue repeatedly) is followed by a gerund (the -ing form of a verb). Since the subject, Flights, is the receiver of the action (they are the ones being delayed, not delaying themselves), the required structure is the passive gerund: $$\text{Kept }+\text{being}+\text{ Past Participle}$$

• Being delayed expresses a continuous action being done to the subject (Flights).