Составьте предложения с этими словосочетаниями: at the city dump, dangerous pollution, to protect from snow, to pollute air, polluted rivers, to waste one"s time, it is necessary to do the job at once.

A lot of things can be found atthe city dump.
Cars cause dangerous pollution.
Special clothes can protect you from snow.
Just a few countries don’t pollute air.
Unfortunately, all rivers in Moscow are polluted.
It’s not wise to waste your time because time passes quickly.
It’s necessary to do the job at once because you may have no time later.