Manyothernewtechniquesarenowavailablethatenablemoreresearch___(do)inthetesttubetoseeifchemicalsproduceharmfulbiologicaleffects.
Expertshavefoundthatnormalsleepcanbedividedintofive______stages
Instudiorecordings,newtechniquesmadepossibleeffectsthatnotevenanelectronicbandcouldproduce.
Apersonisluckyifhiscareer________withhisinterestandhobby