Multiple choice

Because metal of all kinds is the biggest single component of industrial waste, many companies have tried recycling to reduce the cost of waste disposal.

  1. Because metal of all kinds is the biggest single component of industrial waste, many companies have tried recycling to reduce the cost of waste disposal.

  2. Because metal of all kinds is the biggest single component in industrial waste, many companies tried to recycle so that the cost of waste disposal is reduced.

  3. Because metal of all kinds are the biggest single components in industrial waste, many companies have tried to recycle to reduce the cost of waste disposal.

  4. All kinds of metal are the biggest single components of industrial waste, and so many companies have tried recycling to reduce the cost of waste disposal.

  5. All kinds of metal is the biggest single component of industrial waste, so many companies have tried to recycle so that the cost of waste disposal could be reduced.
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A Correct answer
Explanation

‘Metal of all kinds' is singular so ‘are’ cannot be used making options (3) and (4) incorrect. ‘have tried recycling’ - present perfect tense is the correct construct as recycling started in the past and is still continuing. Hence (1).

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