People ______ long distances frequently have to decide whether they would prefer to go by land, sea or air.
When you stand on the top of the mountain and overlook the surrounding scenery, you will find it is ______ to climb it up with effort.
A harmonious society is very important, so all the laws must be strictly______.
It is so noisy in the restaurant and hard for us to ________ a conversation.
Studies show that people are more_____ to suffer from back problems if they always sit before computer screens for long hours.
A survey of health researchers ______ that four hours of exercise every week ____ good for our health.