At the end of the conference, all the_(participate) were asked to fill out a questiolmaire
participants
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In studio recordings, new techniques made possible effects that not even an electronic band could produce .
Manyothernewtechniquesarenowavailablethatenablemoreresearch___(do)inthetesttubetoseeifchemicalsproduceharmfulbiologicaleffects.
A good worker in a key spot could, he kept up production, take all the coffee breaks he wanted, and the bosses would very likely look the other way.