A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.

When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.

A vessel reduces speed without backing. The rate that her speed through the water decreases depends primarily on the（）.

Small floes of rough，hummocky sea ice capable of damaging a vessel（）.

On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.

If a tow sinks in shallow water，you should（）.

When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）

A vessel is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way? （）

All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.

As the weather was worsening and wind force rising to 8，my vessel（）were yawing within forty degrees of the compass.