Hydrogen internal-combustion engine

Hydrogen internal-combustion engine
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  • English as a Second Language (ESL)

  • Technical English

  • Age 18+

  • level: Pre-intermediate

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คำแนะนำของผู้เขียน

(Taken from "Bonamy. Technical English 2". P.61. Ex. 9. Unit 8.2)
Fill in the blanks with the correct Simple Present form of the verbs.