16. 题干：“只能在狭水道或航道内安全航行的船舶”是指：

The third officer takes over the watch ___ the chief officer.

There is ___ Ocean-going vessel in the harbor.

The dockers are busy ___ their work.

It＇s getting dark. Please ___ the cargo lights.

Our captain asked me ___ to the bridge.

They ___ seamen next year.

____ stand here. It＇s dangerous.

When will you leave the port? ___ February 4.

We ____ many European ports every year.

Where are the derricks? They are ___.