Rewrite the following sentences using the first or second conditional (ONLY CÂU ĐIỀU KIỆN LOẠI 1 VÀ LOẠI 2 NHA MỌI NGƯỜII)
1. The balance of nature cannot possibly be maintained _______
A. why people don't realize just how dangerous the situation is
B. before forest lands were managed efficiently
C. so long as there had been groups of people making quick profits through practices harmful to the environment
D. unless every individual and every organization realizes how important it is to protect our environment
2. I can lend you that amount of money _______ you will pay it back to me until next month.
A. what if      B. suppose       C. provided that      D. whatever
3. If it weren't for teachers in a country, the new generations _______ ignorants.
A. would have been B. will have been C. will be D. would be
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