Answer:
1) Sacks
2) Pinch
3) Cartons
4) Barrel
5) Layers
Step-by-step explanation:
The reason for some nouns being in their plural form is that there are multiples of them. For example, there are two cartons of orange juice. As there is more than one, a plural of the noun must be used, which is why the answer to three is cartons and not necessarily carton. Pinch is an exciting one, as while there are technically multiple grains of salt, there is only one pinch being taken of it. That is why despite there being more than one grain of salt, pinch stays singular.