新的环境法规已经出台以减少污染。

New environmental regulations are ___in ___place to reduce pollution.

在伦敦，交通拥堵费自2003年起就已经实施。

In London, congestion charges have been ___in ___place since 2003.

现在所有实验室实验都有一个全面的安全协议生效。

A comprehensive safety protocol is now ___in ___place for all laboratory experiments.