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

William found it increasingly difficult to read，for his eyesight was beginning to  ．

The number of tickets _____ will be determined by the size of the stadium.

—Will $ 2,000 _______ the cost of the trip? —I’m afraid not. Perhaps I need another $500.   

When she heard the good news, there appeared a ___ smile on her face.