Question 15: London’s famous black taxis are a common_______in the streets of the city. A. sight B. appearance C. look D. view Question 16: To everybody’s ___________, the doctor declared the boy was out of danger. A. soothe B. relief C. peace D. calmness Question 17: _________he got lost, he started to call for help. A. To realize B. Realized C. Realizing D. Realize Question 18: When I first started work, I found her advice_____________. A. priceless B. worthy C. irreplaceable D. invaluable Question 19: While aspirin produces fewer________reactions than many other pain-killers, it offers little relief in case of severe or chronic headache. A. adverse B. exact C. partial D. addicted