Multiple choice

Directions: Choose an appropriate preposition to fill in the blanks.

Since the early days we have become aware _________ the ill effect _________ pollution.

  1. of

  2. off

  3. to

  4. with
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The phrase 'aware of' is a fixed idiom in English, and 'the ill effect of pollution' uses 'of' to show possession or relationship. Both blanks require the preposition 'of' to complete these standard expressions correctly.

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