6. 题干： 在弯曲水道中，循相反方向行驶的两机动船航向交叉相互驶近并构成碰撞危险，则：

The sailor on duty will do it by ___.

Where is your chief officer? He is on ___ floor.

Who is responsible ____ the ship?

Is he ___ ordinary seaman?

These people are English ___.

This ship ___ two years ago.

This is ____ American oil tank.

It＇s ___to remain in your present position.

Dry powder is used to put out ___.

Our ship will not sail today. What about ___ ashore?