especially when they face problems like sex, mental stress, etc., which make them feel ashamed and embarrassed. Thus they often automatically get into troubles due to their ____1_____(perfect) comprehension and judgement. Some are addicted to cigarettes, only several packets of ___2____will hurt their lungs and make them breathless quickly. Others can’t quit drinking alcohol, ___3_______harmful effects include causing young pregnant women to abort or give birth to___4_____ (normal) babies. The worst is drug abuse, for the withdrawal is tough once their bodies are accustomed to the drugs. Meanwhile, those who share needles ____5____(buy) from illegal chemists are at great risk of_____6___ ( infect) with desperate AIDS. If so, neither injecting nor taking pills can guarantee their survival.