Let's tackle the first part of your question about pairing words, by figuring out which words belong together and which comes first alphabetically from the two lists provided.
Word Pairs:
Cause (B) and Effect (A) - Commonly used in the phrase 'cause and effect'.
Backwards (A) and Forwards (B) - Together, these directions often signify movement: 'backwards and forwards'.
Forget (A) and Forgive (B) - Often paired in advice: 'forgive and forget'.
Health (A) and Safety (B) - Commonly used in describing regulations: 'health and safety'.
Learn (A) and Live (B) - 'Live and learn' is a phrase about gaining wisdom through experience.
Lightning (A) and Thunder (B) - Represents a weather phenomenon: 'thunder and lightning'.
Pros (A) and Cons (B) - Used to describe advantages and disadvantages: 'pros and cons'.
Quiet (A) and Peace (B) - Often used together to describe tranquility: 'peace and quiet'.
Supply (A) and Demand (B) - Common in economics: 'supply and demand'.
Sweet (A) and Short (B) - Used to describe something brief and pleasant: 'short and sweet'.
Now, for the second part of your question regarding common pairs joined with 'or':
Right or wrong .
Now or never .
More or less .
Sooner or later .
All or nothing .
Once or twice .
Dead or alive .
Rain or shine .
These phrases are commonly used in English to express various ideas and are important in understanding the nuances of the language.