Here are the correct forms of the verbs in brackets:

1. The local people **are cleaning** (clean) up the streets they live on next weekend.
2. The city council **plans** (plan) to recycle 60% of households every year.
3. The shop **doesn't have** (not have) enough fresh fruit and vegetables in the market.
4. Air pollution can cause many diseases, even death.

For the second part of your question (find one mistake in each sentence), here are the corrections:

1. If you don't pay attention, you will understand the lesson. (Correct "If you don't pay" to "If you pay")
2. It is **hot** today - please turn on the air conditioning. (Correct "air condition" to "air conditioning")
3. Governments are working together to protect the environment from pollution. (No mistake)
4. Air pollution can cause many diseases, even **death**. (Correct "the death" to "death")

Let me know if you need further assistance!