Choose the proper -ing form

1. After (leaving/being left) the freezer at 9°C semifrozen ice cream is placed in a suitable container.

2. Consumers were informed of producers (having added/having been added) chocolate, vanilla, fruit and other flavours to frozen desserts.

3. Some people enjoy (having eaten/eating) dietetic and diabetic frozen desserts as they contain less fat.

4. We know of Frank Epperson (having invented/having been invented) Popsiclesin 1923.

5. The shelf life of dried milk products was extended due to their (having been dried/being dried) to less than 4 percent moisture.

6. Many plants increased the production of useful dry products by (having been utilized/having utilized) skim milk, buttermilk, cheese whey etc. as raw materials.

7. The improvements in ice cream manufacturing were impossible without special refrigeration equipment (developing/having been developed).

8. Producers are interested in frozen desserts (consuming/being consumed) not only in summer, but throughout the year.

9. Government inspectors were satisfied with all ingredients of ice cream (having been listed/being listed) and the amount of some additives (having been limited/being limited) in frozen dairy desserts.

10. We know of Americans (starting/having started) wholesale ice cream business in 1851.