21. ______ man sitting near the window is ______ famous researcher in computer engineering.
|
A. A; a
|
B. The; a
|
C. The; the
|
D. A; the
|
22. When he came back three hours later, they were still sitting on the sofa, ______ in conversation.
|
A. absorbing
|
B. absorbed
|
C. to absorb
|
D. to be absorbed
|
23. The workers will go on strike if the demands they ______ are turned down.
|
A. put aside
|
B. put through
|
C. put forward
|
D. put away
|
