He is busy working at school, but he never forgets his mom a phone call every day.

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what he is busy why he stays up if he is worried where he can pass the exam

a waiter, in at work, during watching TV, at a doctor, at

busy diligent careful punctual

if he works hard why is he so busy why he stays up so late when he will stop working

very, that so, that such, as enough, as

nothing none little much

has been working was working w

working；doing working；to do a

if he works hard who he is studying with what he is busy with when he will stop working

if he works hard who he is studying with what he is busy with when he will stop working

if he works hard why he stays up so late why is he so busy when he will stop working

because though or if

will drive has driven is driving drives

if he works hard when he will stop working why is he so busy why he stays up so late

in at by as

if he works hard why he stays up so late why is he so busy when he will stop working

busy　　　　　　　　　　　　　 diligent careful　　　　　　　　　　　　 punctual

gets used to used to got used to is used for

the last first last the first