A．He is a computer supplier.
B．He is a computer designer.
C．He is a computer repairman.
D．He is a computer technician.

A．He has used some heavy-duty tape around the door.
B．He has applied some super glue to keep the hinges on tightly.
C．He has pushed a box against the door to keep it shut.
D．He has simply replaced the old for a new one.