4. Modifying conventions include all of the following except: (a) Periodicity (b) Cost-benefit (c) Materiality (d) Conservatism 5. Hand tools with a small unit cost are charged to expense when purchased even though the individual tools have a useful life of several years. This practice is in accordance with: (a) The accounting entity concept (b) The going-concern concept (c) The matching principle (d) The materiality concept 6. In estimating the appropriate size of the allowance for doubtful accounts, most accountants would rather see this allowance be a little too large than a little too small. This practice is in accordance with: (a) Periodicity concept (b) Expense recognition principle (c) Conservatism (prudence) principle (d) Full disclosure principle 7. An airline records depreciation on its aircraft even though an excellent maintenance program keeps the planes in "as good as new" condition. This practice satisfies: (a) Money measurement concept (b) Expense recognition principle (c) The matching principle (d) Cost-benefit principle