读“日本地图”，回答下列问题。
Peter's father often watches basketball games __________ TV.
He ____ been afraid of dogs ____ ____ since his dad kept a pet dog.
人体能够吸入气体是因为肺富有弹性，当肋间肌和膈肌____ 使得胸腔容积扩大时，肺便____ ，肺内的气体压力相应缩小，外界气体就通过呼吸道进入肺。
