33. Students are more aware of protecting the environment. Teachers teach environmental issues at
school.
=> If teachers teach environmental issues at school, students will be more aware of protecting the environment.
34. People speak English all over the world.
=> English is spoken by people all over the world.
35. Many rivers and lakes are poisoned. Factories produce waste and pour it into rivers and lakes.
=> Because factories produce waste and pour it into rivers and lakes, they are poisoned.
36.They provided food for the victims of the earthquake then cleared up the debris.
=> After they provided food for the victims of the earthquake, they cleared up the debris.