write the correct forms of the words in brackets
1. unless we stop ( cut ).............. down trees in forests , we cant prevent floods and other ( nature)...... disasters
2. if people ( use)....... public transport , there (be)............ less air pollution
3. Nam Cao ( be).................. one of the most( write)............ in Viet Nam
4. I ( not like) ................... watching motor ( race) .......... on TV. it is dangerous
5. No one ( use)............ there textbooks because they were ( publish)............ in 1975