Quizzes, tests, exercises and puzzles for English as a Second Language (ESL), English as a foreign language (EFL), Teaching EFL (TEFL), Test of EFL (TOEFL), English for speakers of other languages (ESOL), Teaching ESOL (TESOL), TOEIC.
Invention : insulin, extraction and preparation of
Year : 1921
Inventor : sir frederick grant banting, charles h. best
Country : canada. .. More >>