Add spaces: Geta15%discountonyourtax-freepurchaseswhenyoupre-orderthemforyourflightonline.

Answer: Get a 15% discount on your tax-free purchases when you pre-order them for your flight online.

Add spaces: ForrecessedmountingofC60-S.Seecompletion.

Answer: For recessed mounting of C60-S. See completion.

Add spaces: Overaperiodofthirtyyearshemademajorcontributionstogeology,particularlyhisinvestigationoffossilremainswhichconvincedhimthatmajorchangeshadoccurredintheEarth'ssurfacewhichhadliftedfossilisedshellsofmarineanimalstohighpointsinmountainranges.

Answer:
Over a period of thirty years he made major contributions to geology, particularly his investigation of fossil remains which convinced him that major changes had occurred in the Earth's surface which had lifted fossilised shells of marine animals to high points in mountain ranges.