`a.` You don't exercise regularly. You won't stay healthy.
A. You won't stay healthy unless you exercise regularly.
B. You won't stay healthy because you exercise regularly.
C. Unless you exercise regularly, you must stay healthy.
D. Unless you exercise regularly, you should stay healthy.

`b.` People become more aware of pollution. The city becomes cleaner.
A. As people become more aware of pollution, the cleaner the city becomes.
B. The more aware people become of pollution, the cleaner the city becomes.
C. As people become more aware of pollution, the clean the city becomes.
D. The more people become aware of pollution, the most clean the city becomes.

`-` muộn r