11. Mr. Smith didn’t know ______.
 A. where his wife was                                 B. where was his wife
 C. where went his wife                               D. where his wife go
12. As ______ matter of fact, there was ______ exploration in ______ last house I visited.
 A. a, an, the                                               B. the, an, a
 C. a, the, the                                              D. the, an, the
13. The Yangtze River is not ______ than the Yellow River.
 A. much longer                                          B. more longer
 C. longest                                                  D. less longer
14. Physics ______ a useful subject.
 A. is                                                         B. are
 C. was                                                       D. were
15. The manager ______ him with responsibility for running the shop.
 A. made                                                    B. left
 C. told                                                      D. let