一．选择（ 20 ）
( )1.We should stop the children from______ the boy’s mistake.
A.to laugh at B.laughing at C.laughed for D. to laugh in
( )2.Have you got any trouble __________ this _______practice?
A. to do,listening B.doing,listening C.done,listening D.do,listen
( )3.The book is __________difficult for me_________understand.
A.too,to B.so that C.not only ,but also D.either,or
( )4.Could you tell me ______________________?
A.how to use computer B.how can I use computer C.what to use computer D.what the computer use