Hi, I am a Canadian citizen travelling in Bangkok, flying to Singapore with a cruise to China.

I am currently in Bangkok but leaving in a couple days to go to Singapore. (not enough time in Bangkok to obtain a visa for China.
I am looking at a cruise that departs from Singapore and arrives in Shanghai and then visiting Shanghai until departing for the United Kingdom two weeks later.
1: Can canadian citizens obtain while in Singapore and 2: It is true that I only need a single entry because our first stop is in Hong Kong with 2 more consecutive stops in China before arriving in Shanghai

Thank you