______, the conference began.

 ______, the conference began.

#91020

The candidates having taken their seats

The candidates had taken their seats

Taken their seats

Taking their seats

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With two children _____ middle school, the parents are working hard.

#91354

attended

being attended

having attended

attending

 With his attention _____ on his book, he didn’t notice me enter his study.

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focusing

focused

to focus

focus

With so many orphans ________，the charity organization calls for more donations.

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to be looked after

being looked after

to look after

looked after

My aunt sang a few old songs, my uncle _______ the piano to accompany her..

#90964

played

to play

playing

play

So far all cloned animals have suffered from some different serious disorders, ______ dying soon after birth.

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many of which

many of whom

many of them

many of that

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