A. stairs B. beat C. understanding D. sister A. worm B. homestay C. near D. news A. had a cold B. goose C. A.M. D. seed A. indiscriminate B. factory C. keep doing D. go sightseeing A. happily B. look out C. penguin D. viperine A. separate B. textbook C. flame D. summary A. rhino B. square C. worst D. roast A. solve B. rub C. leather D. decompose A. agree B. in line with C. empire D. desperate A. questionnaire B. hungry C. purchasable D. Mr.