`41`. wore => were worn
`42`. from => of
`43`. from => of ( one of: một trong những )
`44`. saw => has seen
`45`. are => is ( "a lot of dangerous work" không đếm được => chia số ít )
`46`. by => on
`47`. looking at => looking for ( look for: tìm kiếm )
`48`. Do you finish => Have you finished
`49`. Because => Because of ( because of + Ving/N )
`50`. can => could