A. why not B. instant message C. complain D. bring back to life A. after-class B. station C. deliever D. congestion A. brighten B. candle C. knowledgeable D. desolate A. at school B. bound C. dust D. really A. tool B. pleasantly C. spring D. the Potala Palace A. similarity B. while C. pack up D. omit A. precious B. difficulty C. busy D. sticky A. refer B. sing the birthday song C. ugly D. town A. hobby B. cup C. support D. insoluble A. entertaining B. a bit C. way D. dividing line