We should reduce the usage of cars. A. The cars should be reduced. B. The usage of cars should be reduced. C. The usage of cars should to reduce. People mustn't throw plastic into the ocean. A. The plastic mustn't be thrown into the ocean. B. The plastic mustn't being throw into the ocean. C. The plastic mustn't thrown into the ocean. We have to plant more trees. A. More trees has to be plant. B. More trees have to planted. C. More trees have to be planted. We could build windmills and solar panels to store energy. A. Windmills and solar panels can be build to store energy. B. Windmills and solar panels could be built to store energy. C. Windmills and solar panels could built to store energy. People may use electric scooters and cars. A. Electric scooters and cars may be used by people. B. Electric scooters and cars may been used by people. C. Electric scooters and cars may used by people. We should sort rubbish into different containers. A. The rubbish should be sort into different containers. B. The rubbish should be sorted into different containers. C. The rubbish should being sorted into different containers. We mustn't put chemicals in food. A. Chemicals mustn't been put in food. B. Chemicals mustn't put in food. C. Chemicals mustn't be put in food. Image 1 is a derivative of "Traffic jam in a city with long queue of cars waiting on a road at sunset" by WildMediaSK on Envato Elements Image 2 is a derivative of "Dirty beach landscape full of waste" by davidpereiras on Envato Elements Image 3 is a derivative of "Women hand are planting the seedlings into the soil." by Jcomp on Envato Elements Image 4 is a derivative of "Windmills" by viledevil on Envato Elements Image 5 is a derivative of "Woman standing on electric scooter" by DragonImages on Envato Elements Image 6 is a derivative of "Woman sorting different waste." by korneevamaha on Envato Elements Image 7 is a derivative of "Spiking fruits and vegetables dsc2342" by microgen on Envato Elements