1、He _______ a lot of time in trying to develop the education system in this area.

　　A.involved　　B.investigated　　C.invested　　D.interfered

　　2、They spent many years _______ for oil in this small island.

　　A.exploring　　B.exploding　　C.exposing　　D.exploiting

　　3、Mr. Wang _______ his wife and children when he went to the United States.

　　A.prescribed　　B.delayed　　C.decreased　　D.deserted

　參考答案：

　　1、C　2、A　3、D