Select the most appropriate option to fill in the blanks.

The vibrations from wind instruments ______ always positive and good ______ your breathing and health.

are; for

The correct option to fill in the blanks is are; for.

The sentence is about the vibrations from wind instruments and their effect on breathing and health. The verb "are" is used in the present tense because the vibrations are still having a positive effect on breathing and health. The preposition "for" is used to indicate the purpose of the vibrations.

The other options are incorrect.

• Is; in is incorrect because the verb "is" is singular and does not agree with the plural subject "vibrations."
• Were; to is incorrect because the verb "were" is used in the past tense and does not reflect the fact that the vibrations are still having a positive effect on breathing and health.
• Was; in is incorrect because the verb "was" is singular and does not agree with the plural subject "vibrations."