Mixed verbs- Perfect Tenses

The endangered species __________ (face) a lot of threats due to human activity.

• have faced

• have been facing

• had faced

• had been facing

Before Greta's speech, the youngest population___________(not realise) the threat of the use of plastic.

• hasn't realised

• hasn't been realising

• hadn't realised

• hadn't been realising

The NGO (Non Governmental Organisation) __________ (plant) thousands of trees in the last few months

• has planted

• has been planting

• had planted

• had been planting

She_________ for a while that using public transportation is better for the environment.

• has known

• has been knowing

• had known

• had been knowing

The local community protested because the mayor and his workers____________(propose) the construction of a factory near the river.

• has proposed

• has been proposing

• had proposed

• had been proposing

By the time the government implemented the new environmental policy, climate change ___________(already/damage) the planet.

• has already damaged

• has already been damaging

• had already damaged

• had already been damaging

We __________ (notice) a significant change in the climate patterns over the last decade.

• have noticed

• have been noticing

• had noticed

• had been noticing

The COP26 summit raised further awareness to problems that countries____________(already/debate) in the Paris Agreement in 2015.

• have already debated

• have already been debating

• had already debated

• had already been debating

When we arrived at the beach, someone __________ (leave) a lot of rubbish behind.

• has left

• has been leaving

• had left

• had been leaving

I am totally into environmental issues! I __________ (study) environmental science for two years.

• have studied

• have been studying

• had studied

• had been studying