One of the most important questions they had to consider was ______ of public health.

 Equipped with modern facilities，today's hospitals are quite different from __________ of the past.

-- The committee hasn’t approved __________ of the plans.-- Yes, you see only one is enough.

______ can do a job patiently and attentively for many years unless he loves it.

A scientist who can speak English is in closer touch with those of other countries than ______ who doesn’t.