Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
EinsteinwontheNobelPrizein1921andenjoyedgreatfameinGermanyuntiltheriseofNazism____hewasexpelledfromGermanybecausehewasaJew.
Itisimperativethatstudents_____theirtermpapersontime.
Thethreementriedmanytimestosneakacrosstheborderintotheneighboringcountry_____bythepoliceeachtime.
Pollisanexampleofaseverelydisabledpersonwhohasbecome______atmanysurvivalskills.