Grammar Quiz

[ Grammar ]

Acid rain can be caused due to combustion of fossil fuels or erupting volcanoes or rotting vegetation which ____ sulfur dioxide and nitrogen oxides into the atmosphere.

A. release

B. releases

C. is releasing

D. have released

Select your answer:

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Other quiz:

Past simple - Irregular Verbs › View

A long time ago, the pirates —————-(find) a treasure.

A. find

B. foughnd

C. found

Grammar › View

What is the simple subject of the sentence?

The dusty book sat on the top shelf.
A. The dusty book

B. book

C. sat

D. sat on the top shelf.

How to use : Read the question carefully, then select one of the answers button.