A. pin B. river C. punish D. announcer A. come down B. horizontal C. in advance D. world A. arise B. wait and see C. fire D. aftershock A. stone B. quantity C. central heating D. stalagmite A. maturity B. flower C. advocate D. any time A. safely B. preferential C. to one's surprise D. sky A. sun B. excavation C. rap D. fit in A. frog B. do some research C. island D. resourceful A. ruler B. spokeswoman C. cancer D. sea A. analytical B. kidnapper C. hill D. imperceptible