1.   Environmental groups are exerting pressure on the government to tighten pollution laws.

2.   Planning laws had been tightened to restrict building in high-risk areas.

3.   The general opinion among police officers was that the law should be tightened.

4.   The law was indeed tightened, prohibiting the employment of illegal aliens on the valid assumption that removing the magnet of jobs is necessary to stem illegal immigration.

5.   He wants the law tightened.

6.   Already, some local leaders talk about possibly tightening the law to allow harsher punishment of juveniles.

7.   Along with publicity campaigns, governments have tightened laws and assigned more police to investigate forced prostitution.

8.   A better policy, they said, would be to tighten insurance laws and provide health-care subsidies to the needy.

9.   Across the European Union, governments have tightened immigration laws and beefed up their borders.

10.   Advocates of tightening the law also would restrict each license to one gun and limit the number of licenses and guns an individual could possess.