The letter is from my sister, ______ is working in Beijing.

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is writing    was writing
   wrote    is reading

which that whom who

my's sister My sister's My sisters my sister's

paper letter words Will

So does my sister. So did my sister So my sister does So My sister did

which that whom who

when my sister came back when did my sister come back when my sister will come back when my sister comes back

me sister my sister my sister’ s mine sister

a friend of my sister a friend of my sister's my sister friend my sister friend's

did my sister pay how much my sister paid how much how much did my sister pay how much my sister paid

which that whom who

neither can my sister my sister can’t，too so can’t my sister can my sister，either

a friend of my sister a friend of my sister's my sister friend my sister friend's

my sister my sisters my sister’s my sisters’

seen a letter by heard a letter from heard heard from

is writing was writing wrote is reading

neither can my sister my sister can’t, too so can’t my sister can my sister, either