input question: Fix spacing: Thesecurityoftheexchangeisoverseenbytheworldleaderforonlinepayment,Verisign.

output answer: The security of the exchange is overseen by the world leader for online payment, Verisign.

input question: Fix spacing: CausesofCode35(Error35)

output answer: Causes of Code 35 (Error 35)

input question: Fix spacing: ConcernoverthechangingnorthledtheHarpergovernmenttodeclaretheArcticCanada'stopforeignpolicypriority.

output answer: Concern over the changing north led the Harper government to declare the Arctic Canada's top foreign policy priority.

input question: Fix spacing: CheckratesandavailabilityforHostelLeiden.Thenproceedtobooking.

output answer:
Check rates and availability for Hostel Leiden. Then proceed to booking.