A. happiness B. top C. downtown D. galaxy A. ecosystem B. journalist C. slight D. northern A. dirt B. independent C. build D. astronaut A. dictation B. themselves C. make use of D. take a look A. zip B. resort C. relaxing D. instead A. send B. a great many C. indiscriminate D. happen A. question B. sofa C. break the ice D. strychnine A. publish B. habit C. some D. lava A. cancel B. come along C. just now D. finally A. survivor B. citizen C. plunge D. build sb up