QUESTION: Fix punctuation: There is no fixed formula for how we work with you but we guarantee valuable knowledge through experience
ANS: There is no fixed formula for how we work with you, but we guarantee valuable knowledge through experience.

QUESTION: Fix punctuation: The scissors can be universally used in the household
ANS: The scissors can be universally used in the household.

QUESTION: Fix punctuation: In mainland China and the island of Taiwan Standard Chinese mandarin is the common language
ANS: In mainland China and the island of Taiwan, Standard Chinese (mandarin) is the common language.

QUESTION: Fix punctuation: On Saturday we can expect mainly cloudless weather Morning temperatures will be around 21 C During the day they will reach a maximum of 38 C Low temperatures at night will be around 17C Southwesterly winds are weak
ANS:
On Saturday we can expect mainly cloudless weather. Morning temperatures will be around 21 C. During the day they will reach a maximum of 38 C. Low temperatures at night will be around 17C. Southwesterly winds are weak.