Choose the sentence that best combines each pair of sentences given.

I never turn on the TV when leaving a room. That helps save energy.

Plastic takes hundreds of years to decompose in the ground, that is harmful to the environment.

Plastic takes hundreds of years to decompose in the ground, in which is harmful to the environment.

Plastic takes hundreds of years to decompose in the ground, which is harmful to the environment.

Plastic takes hundreds of years to decompose in the ground, from which is harmful to the environment.

I always turn off the fans when I leave the room and which that helps save energy.

I always turn off the fans when I leave the room, which it helps save energy.

I always turn off the fans when I leave the room, that helps save energy.

I always turn off the fans when I leave the room, which helps save energy.

My father has learned about planting trees in the garden, that contributes to a healthier environment.

My father has learned about planting trees in the garden, in which contributes to a healthier environment.

My father has learned about planting trees in the garden, and which contributes to a healthier environment.

My father has learned about planting trees in the garden, which contributes to a healthier environment.

They stayed for the weekend, which was great.

They stayed for the weekend and which was great.

They stayed for the weekend, which it was great.

They stayed for the weekend and which it was great.

The movie turned out to be a blockbuster hit which came as a surprise to critics.

The movie turned out to be a blockbuster hit which it came as a surprise to critics.

The movie turned out to be a blockbuster hit and which came as a surprise to critics.

The movie turned out to be a blockbuster hit, which came as a surprise to critics.

Reusable bottles are better for the environment than single-use plastic ones.

We should never use reusable bottles but single-use plastic ones.

Single-use plastic bottles are more environmentally friendly than reusable bottles.

Using single-use bottles is the only way to save the environment.

Recycling saves resources, but it causes more pollution.

Recycling not only saves resources but also helps reduce pollution.

Recycling causes both resource loss and pollution.

Recycling has nothing to do with pollution or resources.