用a, an, the,/或者复数形式填空

crime　experience　government　hospital　job　population　rubbish　traffic

1．Many ________ are trying to solve problems which result from too many people．The ________ of many counties is increasing quickly．Because of this, it is difficult to provide enough ________ which people need．

2．People who are ill need places in ________．Policemen are also needed to fight ________ and stop people from stealing．The cities and countryside need to be clean and free from ________．

3．And because of too many cars, trucks and buses, there are a great number of ________ problems．This is not right．Living in a city should be ________ which people enjoy, not one is bad for them．