I think what’s so hard for people and so distracting for people is that where they work, there are social media distractions on the same machine that they are supposed to be using to do their work. Q: what’s so hard for people and so distracting for people: a ____ clause introduced by “what” where they work ... to do their work: a _____ clause, in which “where they work” is an ____ clause of place introduced by “where” and “that they are supposed to be using to do their work” is an _____ clause introduced by “that”, modifying “machine”