Add spaces: C120daysor4months

Answer: C 120 days or 4 months

Add spaces: Fortheavoidanceofdoubt,(a)ITadministratorsworkingonbehalfofacompanymaydownloadandinstalltheSkypeSoftwareontopersonalcomputersorotherdevicesusedbypersonnelofsuchcompany;and(b)youarepermittedtousetheSoftwareatauniversityorothereducationalinstitution,oratwork.SkypereservesallrightsnotexpresslygrantedtoyouundertheseTerms.

Answer: For the avoidance of doubt, (a) IT administrators working on behalf of a company may download and install the Skype Software onto personal computers or other devices used by personnel of such company; and (b) you are permitted to use the Software at a university or other educational institution, or at work. Skype reserves all rights not expressly granted to you under these Terms.

Add spaces: MichelPlancherel'smainresearchfieldswereanalysis,mathematicalphysicsandalgebra.

Answer:
Michel Plancherel's main research fields were analysis, mathematical physics and algebra.