Please help to correct these SENTENCES if they have GRAMMAR mistakes [3] 1. City expansion has posed an extreme threat to heritage sites. Some historical attractions, like ancient temples and cultural dwellings, have to give way to the urban construction, which are seriously destroyed in recent years. 2. Those children who are unrestricted by rules or exposed to abuse are likely to have aggressive behaviors, such as smoking, excessive drinking and even juvenile delinquency. In contrast, their well-behaved counterparts might have bright future. 3. The rapid growth of population should take the responsibility for a large amount of pollution. These contaminants, such as household garbage, traffic fumes and chemical gas emission, lead to a terrible environmental disruption. Despite the continuous struggles against it, it seems that the trend is inevitably irreversible. 4. It is apparent that face-to-face communication is an effective way when people tend to build a good social relationship with their partners. In the Internet era, even though network has totally changed our social behaviors, it cannot ignore the significance of face-to-face communication. 5. With age, people find it difficult to maintain contact with family and friends, as they are occupied with work and other commitments. 6. It is suggested that stiff punishment is an effective method to reduce crime, as offenders are fearful of getting caught and less likely to commit crime. 7. It is difficult for some public services to achieve breaking even, such as public library and museum. In this regard, governments should fund them.