Раскройте скобки, употребив нужную форму причастия (participle 1 или participle 2) 1. (to vary) input, the firm can vary output. 2. there was an increase in the quantity of gas (to produce) last year. 3. the work of a farmworker and a nurse are measured in terms of payment (to receive) 4. (to impose) some restrictions on food prices, governments make it possible for all the people to buy enough food. 5. firms (to produce) computers act as buyers in the markets for services of computer programmers.

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