What makes our earth sick?

- Steel cans make the earth sick.
- Shampoo makes the earth sick.
- Empty bottles make the earth sick.
- Plastic bags make the earth sick.
- ___________ make/makes the earth sick.

(Are the answers all grammatical? What other expressions can we use in the blank? Would you name them? Thank you.)

Yes, the answers are all grammatical.

Badly maintained car engines...
Unrecycled paper...
Freon leaks...

Other teachers may have further ideas.

Yes, the provided answers are all grammatical. Here are some other expressions that can be used in the blank to complete the sentence:

- Air pollution makes the earth sick.
- Deforestation makes the earth sick.
- Pesticides make the earth sick.
- Chemical waste makes the earth sick.
- Fossil fuel consumption makes the earth sick.
- Water contamination makes the earth sick.

These expressions highlight different ways in which human activities can negatively impact the health of our planet.