1) concentrate a) on b) at c) for d) in 2) be fond a) at b) of c) in d) on 3) free a) on/from b) at/of c) for/in d) from/of 4) be interested a) on b) of c) at d) in 5) involve a) in b) at c) on d) of 6) prefer smth a) than b) to c) rather d) rather than 7) listen a) for b) to c) from d) at 8) be sure a) of b) about c) in d) at

Grammar and Vocabulary unit4 Prepositions

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