Chia động từ

7. if everyone........... ( recycle ) paper,metal and glass,we ..... ( not produce ) so much rubbish
8.if you.... ( not water )plants, they....( die)
9.what,.....(happen )if we....(keep)polluting the evironment
10. if people ...(dump)chemicals into rivers,they.....(not be) able to swim in them in the future
11. if people share their cars o go to work,there....(not be) so many car fumes