A．The houses he designed were not comfortable.
B．The ceilings of his houses were too low.
C．The houses he designed were often small.
D．The roofs of his houses often leake

A．To help Joan relieve her tension before the exam.
B．To persuade Joan to spend more time preparing for the exam.
C．To talk with Joan about going to jazz concert.
D．To help Joan to prepare for the performance in the upcoming concert.