Greatly encouraged by what the teacher said, the boy returned to his seat, ____ to study harder.
| A．being determined | B．to determine |
| C．determined | D．having determined |
15．－Tom, you've got an A in the final English exam. Congratulations!
－Thanks. But I never thought the result would come out so fast. The papers_____when I left the teacher's office just now.
| A．were marking | B．were marked |
| C．were being marked | D．had been marked |
14．This is our contribution to______world of the 21st century, world of independence and mutual understanding.
| A．a; a | B．the; the | C．a; the | D．the; a |
13．－Where will you start your work after graduation?
－Mum, it's not been decided yet. I_______continue my study for a higher degree.
| A．can | B．must | C．would | D．Might |
—Sorry indeed, I ________ to your birthday party if …
—Forget it. I know you were out on business.
| A．must come | B．would come | C．must have come | D．would have come |
—Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
| A．was left | B．has left | C．left | D．has been left |