A. hydrogen B. be harmful to C. honour D. ignore A. share with B. fascination C. variant D. project A. emission B. in a row C. don't D. pleased A. homeland B. infectious C. nag D. radio frequency A. polite B. voting C. pristine D. epic A. earthquake B. banana C. accommodation D. heroine A. preferential B. dormitory C. tomorrow D. free of charge A. proposition B. typewriter C. pal D. at the top of A. threaten B. method C. Mercury D. mail A. shake hands B. raincoat C. inexpensive D. uniquely