题目内容：
根据以下资料，回答题：Insurance companies provide a service to the community by protecting it againstexpected and unexpected disasters．Before an insurance company will agree to ___1___anything，it collects accurate figures about the___2___．It knows，for example，that the risk of a man being killed in a plane accident is less than the risk he___3___ in crossing a busy road．This___4___ it to quote low figures for travel insurance．Sometimes the risk may be high，as in motorracing or mountaineering．Then the company___5___a much higher price．___6___too many climbers have accidents，the price rises still further．If the majority of climbers fall off mountains，the company will___7___ to insure them．
An ordinary householder may wish to protect his home against fire or his ___8___ againstburglary．A shop keeper may wish to insure against___9___．Inlocases，the company willcheck its statistics and quote a premium．If it is___11___．it may refuse to quote．If it insures ashop and then receives a suspicious___12___，it will ___13___ the claim as a means of protecting itself against false claims．It is not unknown for a businessman in debt to burn down his own premises so that he can claim much money from his insurance company．He can be sure that the fire will be investigated most carefully．Insurance companies also___14___insurance against shipwreck or disaster in the air．Planes and ships are very expensive，SO a large___15___is charged，but a___16___is given to companies with an accident—free record．
Every week insurance companies receive premium ___17___ from customers．Thesepayments can form a very large total___18___millions of dollars．The company does not leave the money in the bank．It___19___in property，shares，farms and even antique paintings and stamps．Its aim is to obtain the best possible return on its investment．This is not so greedy as it may seem，since this is one way by which it can deep its premiums down and continue to make a profit___20___being of service to the community．
A．assure
B．insure
C．ensure
D．pressure
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