$\boxed{\rm{ fact\qquad recently\qquad sometimes\qquad besides\qquad for\qquad instance\qquad though\qquad while }}$ (a)————man has made tremendous technological progress, he has not able to conquer nature completely, (b)——----- , he is hit by natural calamities, (c) ————, a devastating flood very often occurs in Bangladesh leaving people homeless (d) ———— other various calamities damage and destroy life and property, (e) ————, some of the African countries are affected by drought.

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