Choose the word or the phrase or sentence that best completes each unfinished sentence below

_________ air is one of the many problems we have to solve.

I’m disappointed _________ people have spoiled this area.

The factory was accused ____ having caused higher level of pollution to the environment.

Having denied the responsibility for the environmental it caused, the factory was forced to close down.

With clear evidence, his company couldn't deny having dump a large quantity of toxins into the sea.

These companies were accused on having released a large amount of carbon dioxide into the atmosphere.

You haven’t written to her_________, have you?

We need to cut down on the emission of carbon dioxide into the atmosphere.

Humans now have to suffer the effects of global warming due to having treat the environment irresponsibly.

In the past, a lot of countries denied having contributed to global warming

Land erosion is mainly caused by widespread deforestation.

We couldn’t go on a picnic as planned __________ it was raining.

Global warming has severe impact on water supplies.

Having been warn about the relationship between climate change and the spread of infectious diseases, everyone should get vaccinated.

Deforestation is one of the biggest environmental threats to the ecological balance in the world.

If he ________ hard today, can he have a holiday tomorrow?