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1. as efficient as, foam, water, class A, is, fires, not, extinguishing, in.
2. is, this, as efficient as, method, used by, the one, the fire department.
3. in, the soda – acid extinguisher, use, is, longer, common, no.
4. heat, in, of, the process, and, burning, are, light, released.

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во 2 пункте, если не нужно вопросительного предложения, можно написать This method is as efficient as the one used by the fire department.

1) Foam is not as efficient as water in extinguishing Class A fires.2) Is this method as efficient as the one used by the fire department?3) The soda-acid extinguisher  is no longer in common use.4) Heat and light are released in the process of burning.