A port（）if more than ordinary prudence and skill is needed to avoid exposure to danger there.

A mortgagee only（）entitled to all the freight which the ship is in the course of earning，when his possession of the ship comes into being.

A.sustains
B.maintains
C.becomes
D.has

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A mortgagee does not acquire a right to the freight（）he has taken actual or constructive possession of the ship.

A.where
B.if
C.and
D.unless

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