1/ people must learn about keeping the environment (pollute)
2/ it was very of you to leave the medicine where the children could get it (care)
3/ polluter water can dob hảm to people's health (direct)
4/ he is going to all the bags (collection)
5/ we will make this beach clean and again (beauty)
6/ air and water can make people fall ill (pollute)
7/ a large number of people have made on how to protect the environment (suggest)