A. front B. hippo C. frustrated D. photo album A. seal B. alright C. threat D. watertight A. celebrate B. zoo C. guest D. interrupt A. computer game B. duck C. slaughter D. Benz A. presentation B. prey C. shudder D. cow A. appearance B. robust C. show sb around D. cat A. cough B. firewood C. dog D. psychology A. interplanetary B. heel C. bear D. council A. outside B. keep on C. get out D. goat A. pad B. satisfied C. dolphin D. twofold