Swimming alone ____ be ____ dangerous. Do be careful.

He called to tell me that you are in hospital, otherwise I ______ nothing about it.

 Frankly speaking, I'd rather you________anything about it for the time being.

A left-luggage office is a place where bags ______ be left for a short time, especially at a railway station.

In order to do something meaningful, it’s necessary that you _______ determine what is really important.