1 . Goals help students focus on their journey to a collection of achievements, meaning they make ________ most of their resources and time and can have motivation(动力)during times when they may feel like giving up. (用适当的词填空)

2 . The most effective way to avoid all the problems caused by the use of drugs is not to use them in __________ first place. (用适当的词填空)

3 . Exercise has lots of benefits, one of ______ examples is that it can promote better health. （用适当的词填空）

4 . Even after the Olympics, ________ growth of the Beijing Subway has continued, and there will be 19 lines in total in the coining few years.（用适当的词填空）