Add spaces: ThissonatabyBeethovesisleadingusthroughaseriesofbeautifulvariations:amovementfilledwithtemperamentandhumour,averyfamousfuneralmarchandalightandairyfinale.

Answer: This sonata by Beethoves is leading us through a series of beautiful variations: a movement filled with temperament and humour, a very famous funeral march and a light and airy finale.

Add spaces: Onechildunder6yearsischargedEUR20pernightwhenusingexistingbeds.

Answer: One child under 6 years is charged EUR 20 per night when using existing beds.

Add spaces: ThismassdeficitwhenexpressedinenergyunitsthroughtheEinsteinformulaE=mc²iscalledthebindingenergyofthenucleus.

Answer:
This mass deficit when expressed in energy units through the Einstein formula E=mc² is called the binding energy of the nucleus.