(1) The police say seven people were _____ed for minor offences. (2) They should ______ foreign investment. (3) He is in a state of deep ______ on account of his failure to pass the examination. symptom n. 症状;征兆; virus n. 病毒;病毒性疾病;毒素;毒害; [计算机科学] 计算机病毒; workforce n. 全体员工;(国家或行业等)劳动力; arrest vt. 逮捕;拘捕;止住;n.拘留; attract vt. 吸引;诱惑;引起...的好感;vi.具有吸引力; depression n. 萎靡不振;沮丧;下陷处;坑;