单项选择题
The look-out must be able（）full attention to the（）of a proper look-out．
A.to give/keep B.giving/keeping C.giving/keep D.to give/keeping
单项选择题 She（the vessel）shall if necessary（）and in any event navigate with extreme caution until danger of collision is over.
单项选择题 SAFE SPEED is defined as that speed where（）.
单项选择题 In order for a stand-on vessel to take action in a situation，she must determine that the other vessel（）.
