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Why are two shots thought to be necessary People born after 1957 have not been exposed to a similar ...

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why it is that    why it is    that it is why    it is why  
two days' time    two-days time    two day's time    two days time  
hadn’t thought    haven’t thought    didn’t think    wasn’t thinking  
hadn’t thought   haven’t thought   didn’t think   wasn’t thinking  
thought, hasn’t worked    had thought, didn’t work    thought, hadn’t worked    have thought, hasn’t worked  
To get the body ready for the second shot.  To trigger the production of antibodies.  To get the immune system ready to respond.  To avoid unusual side effects of the vaccin  
had thought  am thinking   have been thinking  have thought  
What...that    That...what    How...why    Why...how  
two days’ time    two-days time    two day’s time    two days time  
To get the body ready for the second shot.  To trigger the production of antibodies.  To get the immune system ready to respond.  To avoid unusual side effects of the vaccine.  
he thought out    did he think out    he did thought out    thought out he  
one in two or three minutes    one after two or three minutes    after two or three minutes    one for two or three minutes  
two days’ time    two-days time    two day’s time    two days time  

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