5. I want to get specialist treatment.
我想看专家门诊。
还能这样说：
I wonder whether I could register with expert service.
I would like to get a specialist for care.
应用解析：
treat of 论述，论及；
treat oneself to 舍得；
treat sb. white 正直、诚恳地对待某人；
treat to 款待，招待
6. To see the doctor in this country, you need an appointment.
在这个国家看医生，你需要预约挂号。
还能这样说：
An appointment is necessary if you need to see a doctor in this country.
You need to make an appointment with a doctor in this nation.
应用解析：
You're the doctor.
你是专家；由你决定；我听你的。
7. How much do I need to pay for the registration?
我需要付多少挂号费？
还能这样说：
How much do I need to pay my registered fee here?
How much are you going to charge me for the registration?
谚语：
Equal pay for equal work.
同工同酬。
8. Please pay ten Yuan for the registration.
请交10元挂号费。
还能这样说：
You should pay ten Yuan for the registration fee.
Please pay ten Yuan for your registration fee.