Grammar exercises
Exercise VIII. Open the brackets.
English (to have) several hundred million native speakers. For them English (to be) their mother tongue. For us English (to be) not our mother tongue but a foreign language. Ukrainian, Russian, French, German, Chinese and some other languages also (to have) vast numbers of speakers. There (to be) people who know three, four, five or six languages. They (to be) polyglots. They study languages because knowledge of languages (to be) their speciality or hobby. For a modern engineer and research worker it (to be) absolutely necessary to have practical command of foreign languages. A scientist who can read the literature of his field in several languages (have) a much better grasp of the subject.

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