11 Americans              the tradition of volunteering and helping one another since the early days of the country.

     A. have had            B. has had                     C. had                    D. to have

12.My brother and I       a white tiger already.

     A. have seen           B. has seen              C. see                    D. are seeing

13.I       blood twice, and       presents to sick children in the hospital recently.

     A. donate - give                                                B. donated — gave

     C. have donated - have given                        D. have donated - gave

14.How many novels       Charles Dickens         ?

     A. does - write       B. have - written          C. did - written            D. did - write

15.We       to Ha Noi several times, but last summer we      there by train.

     A. flew - went                                                   B. has flown - went        

     C. have flown - have gone                              D. have flown - went