I don’t know（）there’s any shortage or not.

—Do the dishes,Mike,or I will tell mum!

—Do you learn Russian or French?—I learn _____.

—Do you learn Russian or French?—I learn ______.

Please wireless to let me know（）I am to anchor or to meet pilot.

What should be used to steer an open lifeboat if the rudder becomes lost or damaged?（）

I think you should end it ______ it is too late, or you will be sorry for it.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.

If you do not know the subject, you will not understand what is said or written, even if English is your mother （） what is said or written.