20. What is your __________ tropical storm warning information? (A) latest (B) lethal (C) least (D) nowadays

40. Every vessel shall ___________maintain a proper look-out by sight and hearing as well as by all available means appropriate in the prevailing circumstances and conditions so as to make a full appraisal of situation and of the risk of collision. (A) at all times (B) often (C) sometimes (D) usually