Every vessel which is directed by these Rules to keep out of the way of another vessel shall，if the circumstances of the case admit，avoid（）.

Every vessel which is（）to keep out of the way of another vessel shall，so far as possible，take early and substantial action to keep well clear.

A.detected
B.decided
C.directed
D.deceased

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Every vessel shall（）maintain a proper look-out by sight and hearing as well as by all available means appropriate in prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.

A.in fog
B.at night
C.in narrow fairway
D.at all times

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