Fill in the blank with a suitable preposition.
Wear your goggles _______ you start doing the experiment, to avoid accidents.
Fill in the blank with a suitable preposition.
Wear your goggles _______ you start doing the experiment, to avoid accidents.
The correct option is D before
The preposition ‘at’ is used to speak about an exact time or place. Since the statement doesn’t refer to a specific time or a particular place, option A is incorrect. The preposition ‘until’ is used to refer to the time till which an action takes place. When we use ‘until’ in this sentence, it would mean one needs to wear the goggles till the experiment starts which would be illogical since goggles are used to protect one’s eyes during an experiment. Similarly ‘after’ is used to denote the action that needs to be performed after another action. Since wearing the goggles is the first step while working in a lab, options B and C are incorrect. Whereas the preposition ‘before’ is used to denote the action that precedes a subsequent action. In the given context wearing goggles is followed by performing the experiment, therefore option D is correct.
The preposition ‘at’ is used to speak about an exact time or place. Since the statement doesn’t refer to a specific time or a particular place, option A is incorrect. The preposition ‘until’ is used to refer to the time till which an action takes place. When we use ‘until’ in this sentence, it would mean one needs to wear the goggles till the experiment starts which would be illogical since goggles are used to protect one’s eyes during an experiment. Similarly ‘after’ is used to denote the action that needs to be performed after another action. Since wearing the goggles is the first step while working in a lab, options B and C are incorrect. Whereas the preposition ‘before’ is used to denote the action that precedes a subsequent action. In the given context wearing goggles is followed by performing the experiment, therefore option D is correct.
