A. danger B. hierarchy C. exempt D. national A. collect maps B. grass C. burst D. feed on A. approve B. yesterday C. grace D. in practice A. elevator B. past C. knock on D. save A. wide B. leaf C. take part in D. clump A. play sports B. sweet C. too much D. be tired out A. sometimes B. wonderland C. context D. kill A. wife B. fur C. good-humouredly D. on vacation A. dirty B. storeroom C. face D. moth A. precious B. hover-train C. inspector D. desertification