A. activity B. farm the land C. discussion D. volcanic A. either or B. helmet C. torch D. stick A. completely B. inn C. progress D. in a word A. till now B. politely C. tell a lie D. hiking A. redwood B. role C. oxygen D. concentrate on A. decide B. bus driver C. appreciation D. adopt A. Santa Claus B. has C. safely D. hasn't A. epidemic B. based C. cluster D. video A. journey B. submarine C. direct D. come to power A. due to B. increasingly C. support D. lifeboat