A. pay attention B. lock C. terrestrial D. in class A. recorder B. by hand C. challenge D. imperceptible A. Apollo B. sponsor C. cemetery D. miserable A. foreman B. officially C. his D. kung fu A. teach B. butterfly C. questionnaire D. administrative A. missing B. coastal C. thermodynamics D. amazed A. unduly B. sociologist C. key D. shout A. oxygen B. enjoy C. crawl D. graduation ceremony A. auntie B. sort out C. checker D. relax A. likelihood B. at birth C. fall behind D. geology