20. 题干： 根据《国际海上避碰规则》规定：

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 ___.

We have ____ blue paint.

He often teaches ___ to speak English.

Li Ming and I ____seaman.

Who ___ you? I＇m a sailor.