Meaning: 'Was' indicates that something happened in the past.

Wrong options:

• were: The word 'were' is the past tense of 'to be' used for plural subjects, which does not fit here as 'installation' is singular.
• call: The word 'call' is a verb that does not fit grammatically in this context as it does not indicate a state of being.
• reminder: The word 'reminder' is a noun and does not fit as a verb in this sentence.
• already: The word 'already' is an adverb that indicates time but does not serve as a verb in this context.
• again: The word 'again' is an adverb that indicates repetition, which does not fit the grammatical structure here.
• ways: The word 'ways' is a plural noun that does not fit as a verb in this context.

Correct answer: already

Explanation: The word 'already' is an adverb that indicates that something has happened before the present time, which fits the context of discussing ongoing consequences of marine pollution.

Meaning: 'Already' means before the present time or earlier than expected.

Wrong options:

• was: The word 'was' is a past tense verb that does not fit as it does not convey the timing of the consequences.
• call: The word 'call' is a verb that does not fit in this context as it does not relate to the timing of consequences.
• reminder: The word 'reminder' is a noun and does not fit as an adverb in this context.
• were: The word 'were' is a past tense verb used for plural subjects, which does not fit here as it does not convey the timing of consequences.
• again: The word 'again' is an adverb that indicates repetition, which does not fit the context of ongoing consequences.
• ways: The word 'ways' is a plural noun that does not fit as an adverb in this context.

Correct answer: call

Explanation: The word 'call' is a verb that fits grammatically as it indicates an action performed by the subject, referring to how we refer to our home or environment.

Meaning: 'Call' means to name or refer to something.

Wrong options:

• was: The word 'was' is a past tense verb that does not fit as it does not indicate an action related to naming or referring.
• reminder: The word 'reminder' is a noun and does not fit as a verb in this context.
• already: The word 'already' is an adverb that does not fit as a verb in this context.
• were: The word 'were' is a past tense verb used for plural subjects, which does not fit here as it does not indicate an action related to naming.
• again: The word 'again' is an adverb that indicates repetition, which does not fit the context of naming or referring.
• ways: The word 'ways' is a plural noun that does not fit as a verb in this context.

Correct answer: reminder

Explanation: The word 'reminder' is a noun that fits grammatically as it serves as the object of the sentence, indicating the purpose of the installation.

Meaning: 'Reminder' refers to something that serves to make someone remember something.

Wrong options:

• was: The word 'was' is a past tense verb that does not fit as a noun in this context.
• call: The word 'call' is a verb that does not fit as a noun in this context.
• already: The word 'already' is an adverb that does not fit as a noun in this context.
• were: The word 'were' is a past tense verb used for plural subjects, which does not fit here as it does not serve as a noun.
• again: The word 'again' is an adverb that indicates repetition, which does not fit as a noun in this context.
• ways: The word 'ways' is a plural noun that does not fit as a noun in this context.