教室: classroom...
悬念: suspense in a movie, play etc, concern for sb's welfare...
折叠: to fold, collapsible, folding (bicycle, antenna, bed etc)...
乒乓球: table tennis, ping-pong, table tennis ball...
官司: lawsuit...
监督: to control, to supervise, to inspect...
雕: bird of prey...
护: to protect...
招标: to invite bids...
络绎不绝: continuously; in an endless stream (idiom)...