I hope I will not be called on in class as I am not yet ________prepared.

 It is sometimes of great _____ to explain to the patient what is happening.

Though winters in Britain are cold and there is usually snow, there are ________ places for skiing.

There were so many people on the platform waiting to ____ the train that we gave it up. 

With modern equipment，many mysteries have ________ to light in recent years.