Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đáp án (Đề 5)

More than 400 million people speak English (78) ………………….. their mother tongue. Another 400 million speak it as a second language

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More than 400 million people speak English (78) ………………….. their mother tongue. Another 400 million speak it as a second language

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Giải thích

More than 400 million people speak English (78) as their mother tongue. Another 400 million speak it as a second language