3) Use the verbs in brackets in the form of gerund or infinitive, add prepositions where necessary. 1. After (to develop) mechanical refrigeration manufacturers had no difficulty (to start) (to produce) ice cream for mass consumption.
2. People tried (to make) ice desserts thousands of years ago.
3. The company tried (to install) the new refrigeration equipment as soon as possible and succeeded (to commission) the new shop by summer.
4. The new brand of ice cream needs (to advertise).
5. Reduced-fat ice cream became popular and started (to be produced) on a large scale after a campaign for healthy food was launched in America.
6. Sugar prevents bacteria (to multiply) in milk.
7. A stabilizer is added to milk to avoid (to separate) during storage. The manager considered the advantages (to sell) the by-products to another company instead of (to process) them themselves.
8. Without (to age) the ice cream mix the manufacturer will have difficulty (to obtain) a smooth product.
9. The board of directors approved (to give up) (to use) the hardening room and (to substitute) a hardening tunnel for it. But they decided against (to begin) (to reconstruct) the storage area.

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