10 Gambling is lawful in Nevada.

　　A popular

　　B booming

　　C legal

　　D profitable

　　11 These are their motives for doing it.

　　A reasons

　　B excuses

　　C answers

　　D plans

　　12 The river widens considerably as it begins to turn west

　　A twists

　　B stretches

　　C broadens

　　D bends

　　13 Henry cannot resist the lure of drugs

　　A abuse

　　B flavor

　　C temptation

　　D consumption

　　14 These programmes are of immense value to old people.

　　A natural

　　B fatal

　　C tiny

　　D enormous

　　15 A great deal has been done to remedy the situation

　　A maintain

　　B improve

　　C assess

　　D protect