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21、 ________ the trade between the two countries reached its highest point.

A. During the 1980s when                    B. That it was in the 1980s

C. It was in the 1980s that                     D. It was in the 1980s when

20、―Welcome, miss. May I help you?

―________. I want a lipstick.

   A. Sounds great                                     B. I hope so

   C. You’re welcome                             D. Please yourself

19、He had already walked three or four miles ________ he saw a cart, half-full of hay, by the side of the road.

A. when             B. while                   C. until                    D. unless

18、A photo ________ on Aug. 23, 2008 shows a bird’s eye view of the Bird’s Nest, shining with colors and lights during the Beijing 2008 Olympic Games.

A. taking             B. taken                C. was taken          D. is taking

17、When it comes to “The Best Tourist Attractions in China”, the first ________ impresses us is Mianyang.

A. that             B. one                   C. which                 D. what

16、―Oh, my God! I just missed the last bus back home.

―That’s really bad. I’m sure you ________ it, but you were not in a hurry.

   A. could catch                                     B. had caught

   C. could have caught                            D. would catch

15、I’d like to do something for you ________ everything you’ve done for me.

A. in exchange for                                 B. in tune with

C. in return for                                      D. in terms of

14、―How is your work getting along?

―I can’t carry on ________ any longer. I have to get some help.

 A. singly              B. simply               C. lonely              D. alone

13、He failed to come on time, because his car ________ in the heavy snow.

  A. was sticking                             B. got stuck

  C. is sticking                                D. gets stuck

12、―Well! Tom, can you explain what I've just said?

―Oh, I'm sorry. I ________. Would you please say it again?

  A. didn't notice                                      B. am not noticing

  C. was not noticing                                D. hadn't noticed