The seller _________ the CD player for $50, but the customer offered $30.
| A．would sell | B．used to sell | C．sold | D．insisted selling |
20. In many places in China, ____ bicycle is still _____ popular means of transportation.
| A．a; the | B．/; a | C．the; a | D．the; the |
19. My grandpa has many hobbies which _________ from collecting stamps to planting flowers.
| A．range | B．ranged | C．vary | D．Varies |
18. It was ______ back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
17. -- My mother always tells me to try my best _______ many difficulties.
-- I can’t agree any more. _______ you put your heart into work, you can overcome them.
| A．because of / As far as | B．due to / As soon as |
| C．in spite of / As long as | D．despite of / As much as |
16. Charles Babbage is generally considered _______ the first computer.
| A．to invent | B．inventing | C．to have invented | D．having invented |