48、The physicist has made a discovery, ( )of great importance to the progress of science and technology.

62、Very few scientists ( ) with completely new answers to the world's problems.

61、The main road through Littlebury was blocked for three hours today after an accident ( )two lorries.

60、You can do it if you want to, but in my opinion it's not worth the( )it involves.

59、When there was a short( )in the conversation, I asked if anyone would like anything to drink.

58、He must give us more time,( )we shall not be able to make a good job of it.

57、Although the false banknotes fooled many people, they did not( )to close examination.

56、If he( )in that way for much longer he will find himself in the bankruptcy court.

55、The brilliance of his satires was( )make even his victims laugh.

54、( ) no cause for alarm, the old man went back to his bedroom.

53、Western Nebraska generally receives less snow than ( ) Eastern Nebraska.