Please capitalize where necessary: on the strength of this mr. wickham steed cabled instructions to the times to disregard and not to publish anything received from lord northcliffe, and on june 13, 1922 he left, never to see lord northcliffe again.
A: On the strength of this Mr. Wickham Steed cabled instructions to The Times to disregard and not to publish anything received from Lord Northcliffe, and on June 13, 1922 he left, never to see Lord Northcliffe again.

Please capitalize where necessary: as far as possible, try to avoid mucus-secreting foods like dairy products, fatty and fried food, sugar, eggs, white flour, and alcohol.
A: As far as possible, try to avoid mucus-secreting foods like dairy products, fatty and fried food, sugar, eggs, white flour, and alcohol.

Please capitalize where necessary: 7. if you are under the age of 18 you must have permission from your parents or guardian before ordering
A: 7. If you are under the age of 18 you must have permission from your parents or guardian before ordering

Please capitalize where necessary: this book contains the same text (apart from minor variations in spelling).
A:
This book contains the same text (apart from minor variations in spelling).