＿＿＿＿to my regret, I am unable to accept your warm invitation.
| A．Very | B．Much | C．Great | D．A lot |
17. In China, _______ bicycle is ______ popular means of transportation.
| A．the; a | B．a; / | C．the; the | D．a; the |
18. --- What do you think of the furniture on exhibition?
--- Well, great! But I don’t think much of _______ you bought.
| A．the one | B．it | C．that | D．Which |
19. The best job is _______ which uses your skills in doing something together with your interest in the subject.
| A．something | B．the one | C．one | D．it |
20. In the past ten years, great changes _______ in my hometown.
| A．took place | B．have taken place |
| C．were taken place | D．have been taken place |
21. The third and last chapter _______ by Professor Chen.
| A．are written | B．are writing | C．is written | D．is writing |