Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.

Gary has planned to take a tour around the Great Lakes in the coming summer vacation and（） great pleasure from the visit.

When the renewal verification is completed more than three months before the expiry date of the existing Document of Compliance or Safety Management Certificate, the new Document of Compliance or the new Safety Management Certificate should be valid from the date of （） for a period not exceeding five years.

In(74), the only element that can be deleted or removed is the one that was inserted most recently.

● In （74） the only element that can be deleted or removed is the one that was inserted most recently.（74）

The top of the Great Wall is（）for five horses to go side by side.

Among the five Great Lakes, only （）is wholly within the United States.

The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）

The top of the Great Wall is（）for five horses to go side by side.

教师的知识结构中，小学英语教师所拥有的英语学科知识属于()。

Advection fog holds longest over which portions of the lakes? （）

Advection fog holds longest over which portions of the lakes?（）