You already know the words from these new units – now it’s time to use them precisely. One small change can completely change the meaning. Can you form the correct word? Complete each sentence using the correct form of the word in brackets.
The word must fit the meaning and grammar of the sentence. Before showing your knowledge, revise word formation rules: Word Formation – Prefixes and Suffixes in Action
 
1. The documentary showed how plastic waste has become a problem worldwide. (destroy)
 
2. In many rapidly growing cities, high remains a serious social issue despite economic development. (employ)
 
3. Without proper education, people may the risks of air pollution and its impact on health. (understand)
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