Add spaces: Pantyhosesmustnotbetootightandshouldbemadeofcottonorhaveacottonlininginthecrotch.

Answer: Pantyhoses must not be too tight and should be made of cotton or have a cotton lining in the crotch.

Add spaces: Notonlyisthisconvenientandrelaxing,butalsoimprovessafety.

Answer: Not only is this convenient and relaxing, but also improves safety.

Add spaces: *SomeZNWfileextensionformatscanbeopenedinbinaryformatonly.

Answer:
* Some ZNW file extension formats can be opened in binary format only.