If students ______ more about the environment, they will protect it better., learn, learned, will learn, learning, You can join the club ______ you follow the rules., unless, as long as, because, although, You can take part in the project ______ you complete your tasks on time., unless, provided that, because, if not, We won’t reduce pollution ______ people change their habits., if, unless, when, because, If we ______ more trees, the air will be cleaner., plant, planted, will plant, planting, The more people recycle, ______ the environment becomes., cleaner, the cleaner, cleanest, the cleanest, As long as you ______ hard, you will achieve your goals., work, worked, will work, working, Students can use the lab ______ they are supervised by a teacher., unless, as long as, although, because, You can’t improve your English ______ you practice regularly., if, unless, when, although, The more you use public transport, ______ pollution there is., less, the less, least, the least.

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