单项选择题
My Deratization Exemption Certificate will become （）on the 16th of September.
A.due B.expire C.lawful D.non-effective
单项选择题 The certificate of nationality （） serves as evidence of the nationality of the ship （） shows the port of registry.
单项选择题 The certificate shall have effect （） all Chinese ports.
单项选择题 The certificate will remain in force （）July lst,2008.
