Methane is odorless gas and is the main ingredient of natural gas.
Correct answer B. odorless
Tip: press A, B, C or D to answer, and N for the next question.
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See allIdentify the part of the sentence that contains an error: Horse is a faithful animal.
Correct answer A. Horse
It was once Republicans, we voted for democratic candidate now?
Correct answer A. it was once
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I’ve read history of United States.
Correct answer D. United States
When the island of Surtsey was eighteen months old, a first green plant appeared.
Correct answer C. a first
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