15. By the time we ____ to the train station, Susan _____ for us for more than two hours.

A. will get / has been waiting                                    B. got / was waiting

C. got / had been waiting                                           D. get / will wait

16. While her brother was in the army, Sarah ___________ to him twice a week.

      A. was writing              B. wrote                                C. has written       D. had written

17. The Titanic _______ the Atlantic when it _______ an iceberg.

A. was crossing / struck                                            B. had crossed / was striking

C. crossed / had struck                                              D. is crossing / strikes

18. In the 19th century, it ______ two or three months to cross North America by covered wagon.

       A. took                       B. had taken                          C. had taken          D. was taking

19. Last night at this time, they _____ the same thing. She ______ and he ­­­­­­­­­­­­­­­­______ the Newspaper.

A. are not doing / is cooking / is reading                   B. were not doing / was cooking / was reading

C. was not doing / has cooked / is reading                 D. had not done / was cooking /read

20. When I _____ home last night, I ____that Jane ______ a beautiful candlelight dinner.

A. had arrived / discovered / prepared         B. was arriving / had discovered / was preparing

C. have arrived / was discovering / had prepared        D. arrived / discovered / was preparing

cứu (lần 4)