Which sentence/s is/are cliché (陈词滥调句子)? (1) Recently the government agencies in some big cities have been studying the possibility of putting a “pollution tax” on private cars. (2)This has caused a great stir among the public. (3) Some people hold the opinion that it is an effective way to control the number of cars and reduce the amount of pollution in the city, but others don't think so. (4) As far as I'm concerned, private car owners should be properly taxed for pollution.