C. Fill in the correct passive form of the verbs in brackets. 11 Jigsaw puzzles ……….. (make) in 1760 by John Spilsbury.
12 He ………. (offer) to go to the Snowdon mountains in Wales this week.
13 The translation of these articles ………… (finish) by the next week.
14 Tons of toxic fumes …………. (produce) by the factory each year.
15 I’m sorry, your food …………..(prepare) still by the chef