Question 5: We should do something to protect water from being tarnished _____ we will have nothing to drink in the future.
Exception to the conditional sentence type 1, use or to give the consequence of the conditional clause.
Do not use if or unless in the main clause divided in TLD, answers A, D are wrong.
Answer B could not complete the sentence with correct grammatical structure
We should do something to protect the water from pollution, otherwise we won’t have anything to drink in the future.