If you want to become a Canadian citizen, you must:
No, there is no obligation to apply for Canadian Citizenship; but it is in your own interest to apply as soon as possible once you complete the residency requirement.
Since 1977, Canada has permitted its citizens to hold dual or multi Citizenship. As a result, Canadian citizens will not lose their Canadian Citizenship if they retain their former nationality or become citizens of another country. If you intend to become a Canadian citizen, you are advised to verify whether the country of your current nationality permits dual citizenship.
If you do not pass the test, you are sent a notice to appear for an interview with a citizenship judge.
No. Marriage to a Canadian citizen does not give you citizenship. You must first apply and obtain permanent residence, then apply for Canadian citizenship and meet the same requirements as any other person seeking citizenship in Canada.
If your citizenship certificate was lost, stolen, damaged or destroyed, you can apply for a replacement.