Add punctuation: Most breathing problems require admittance into a hospital until the patients inability to take in sufficient oxygen has been resolved
A: Most breathing problems require admittance into a hospital until the patient's inability to take in sufficient oxygen has been resolved.

Add punctuation: Flexibility is essential in a well made shoe If the product wont bend then it can impair your agility and cause discomfort and even blisters
A: Flexibility is essential in a well made shoe. If the product won't bend then it can impair your agility and cause discomfort and even blisters.

Add punctuation: There are many small shops with various crafts in addition to many small delicious street kitchens and restaurants
A:
There are many small shops with various crafts in addition to many small delicious street kitchens and restaurants.