44. We can surely overcome these difficulties _,___ we are closely united.

A. so far as             B. so long as   C. as soon as       D. as well as

43.___ difficult the task may be, we must fulfil it this month.

A. No matter how B. No matter what       C. No matter when   D. No matter where

42.___you understand this rule, you will have no further difficulty.

     A. Once                  B. At once             C. Only               D. Only then

41.____ you work, you must always serve the people heart and soul.

A. Wherever              B. Whenever           C. Where              D. When

40.I'll discuss it with you ____ you like to come. 

A. when                    B. where                    C. whoever                 D. whenever

39.____ makes mistakes must correct them.       

A. Who  B. What   C. Whoever  D. Whatever

38. You are certainly right,____ others may say.        

A. what  B. whatever   C. that    D. as

37. We must do ____ the people want us to do..

A. whatever              B. however            C. wherever            D. whenever

36. It rained heavily,____ the basketball match had to be put off.

A. so that                B. when                C. otherwise    D. therefore

35. You must work hard,____ you will not learn English well.

A. if                    B. whether             C. otherwise     D. unless