5. prevent/ restrain/ hinder/ refrain/restrict/confine/limit

　　Vitamin C is supposed to ______ people from catching colds.

　　If you can't ______ your dog you must lock it up.

　　He ______ himself to five cigarettes a day.

　　I wish the speaker would ______ himself to the subject.

　　Please ______ from smoking during the performance.

　　Heavy snow ______ construction work.

　　We must ______ our expense to what we can afford.

　　答案：

　　1. revenue, revenue, income, salary, wage, bonus, premiums, allowance

　　2. scolded, charged, accused, blamed, sentenced, penalized

　　3. fee, charge, expenditure, expense, tuition

　　4. range, ranged, scope, scale, span

　　5. prevent, restrain, restricted, confine, refrain, hindered, limit