EX1  : READ THE PASSAGE CAREFULLY , THEN CHOOSE THE BEST OPTION 
                                            WHAT WAS THE BIGGEST FLOOD IN THE WORLD ?
The biggest flood was in 1931 , in China . The flood affected a large part of China including major cities such as Wuhan and Nanjing . The flood ( 26 )............................in June , 1931 and lasted for almost three months . Snow in the mountains became water and went into the rivers . Heavy rains ( 27).....................the water to rise even more in the Yangtze River . The water level went up very high , and it caused a very big flood . It covered an area of land larger than England . The flood damaged and destroyed buildings in this area ( 28)..............left 80 milllion people without a home . It also destroyed farms in the affected area . After the flood , there wasn't (29)................food , so people became hungry . There was no clean water , so people had many dangerous disasters . ( 30 )......................than four hundred thousand people died . 
    Question 26:     A. opened               B. started               C. ended               D. went 
    Question 27 :    A. caused                B. are causing        C. cause               D. will cause 
    Question 28 :    A. or                        B. but                     C. and                   D. also
    Queston  29:    A. lots                      B. enough               C. many                D. a lot 
    Question 30:    A. Much                  B. Many                   C. Most                  D. More