Read the text and fill in the gaps with the correct form of verbs as per subject and context.

Cooperation means (a)----(work) together for the benefit of all. Without cooperation, modern society (b) ---- (exist). Cooperation (c)--- (see) at its best among farmers' in the dry regions of some parts of Australia and America. The fields (d) ----(irrigate) in these regions. Crops (e) ---(not grow) without water. Water (f) ---- (bring) to the fields without streams being trapped higher up. For this purpose, canals and dams (g) ---- (build). The canals (h)-- - (cut) through the fields of more than one farmer. Those who (i)----(live) higher up the valley than the others (j) --- (allow) to build canals through their lands in order to carry water to the fields of farmers lower down. In times of drought, all (k)---(be) able to share the water. Instead of (1) ---- (take) all wafer for themselves, the farmer on the higher land leave enough for the neighbours down the valley. Farming in dry areas (m) ---- (make) possible by such cooperation. By cooperation, farmers have learned to make even the desert (n) ----(produce) crops