18.She hired a lawyer to investigate, only to learn that Gabriel had removed her name from the deed. The infinitive verb phrase “only to learn” is used( ) .

67、The police let him go, because they didn't find him guilty( )the murder.

66、The guest team was beaten by the host team 2( )4 in last year's CFA Cup Final.

65、The local authorities realized the need to make( )for elderly people in their housing programmes.

64、The chairman of the company said that new techniques had( )improved their production efficiency.

63、The fact that the management is trying to reach agreement( )five separate unions has led to long negotiations.

62、We should always bear in mind that( )decisions often result in serious consequences.

61、The Olympic Games( )in 776 B.C.in Olympia, a small town in Greece.

60、The scientists have absolute freedom as to what research they think it best to( ).

59、She refused to( )the door key to the landlady until she got back her deposit.

58、More often than not, it is difficult to( )the exact meaning of a Chinese idiom in English.