28、The other day, a thunderstorm caused severe damage to some scenic spots, and therefore it will be quite some time _______ they return to normal.

   A. until                       B. when                           C. before                      D. if

27、It is said that the Chinese shadow boxing has been ________ for many hundreds of years.

   A. on                          B. above                          C. through                    D. around

26、Hardly ________ my car in the parking lot when I realized that I had left my keys in it.

   A. did I park               B. had I parked                 C. I had parked             D. I parked

25、In general, good teaching methods are those that actively ________ students in learning.

   A. involve                   B. present                        C. postpone                  D. undertake

24、We don’t like such kind of people who always _________ that they know everything about anything.

   A. give out                  B. turn out                       C. figure out                 D. make out

23、A new standard has been ________ to judge whether the products fit the requirements.

   A. decided                  B. set                               C. determined            D. bent

22、In the past two years, the world’s economy has gone into a ________, which has even affected people’s life in some countries.

   A. decline                   B. release                         C. increase                   D. decrease

21、It’s a(n) ________ to robbery to leave your cash visible to the eye.

 A. guidance              B. invitation          C. addiction            D. carelessness

20、In fact, Picasso abandoned the old style of painting and starting from scratch, ________a style of art known as cubism.

   A. to create                 B. creating                       C. created                     D. having created

19、 Just on the surface of the pond ________, giving people a feeling of being peaceful.

   A. floated hundreds of lotus plants                       B. did hundreds of lotus plants float     

  C. hundreds of lotus plants were floating               D. hundreds of lotus plants floated