A. difficult B. junk food C. observe D. cooker A. at the end of B. edition C. art D. operate A. keyboard B. throw light on C. easy D. barbarian A. South Pole B. sale C. Tuesday D. toot A. outdoor B. model C. English D. be crazy about A. come from B. from to C. butterfly D. limit A. information B. No parking C. not any longer D. history A. jewel B. Space Museum C. meanwhile D. attention A. guarantee B. meeting C. the Spring Festival D. yellow A. personnel B. mobile C. shirt D. program