IV. Cloze Test It has been said that everyone lives by selling something. ___26___ of this statement teachers live by selling knowledge, philosophers by selling wisdom and priests by selling ___27___ comfort. Though it may be possible to measure the value of material goods in terms of money, it is extremely difficult to ___28___ the true value of the services people perform for us. There are times when we would willingly give everything we ___29___ to save our lives, yet we might be reluctant to pay a physician a high fee for offering us ___30___ this service. Skills have to be paid for in the same way that goods are paid for at a shop.