— Why do you do volunteer work in the North—West？
— I_____ to improve the lives of the children there through my efforts．
| A．was trying | B．have tried |
| C．am trying | D．tried |
Mandela, devoted all his life to the freedom of South African Blacks, is a real fighter for us to ________.
| A．live up to | B．come up to | C．make up to | D．look up to |
Tom concluded his lecture ________ that he couldn’t emphasize enough how important our efforts were.
| A．to say | B．saying | C．said | D．having said |
My mother is the type of woman who suspects that a late night call or a surprise invitation is a ________ of bad news.
| A．symptom | B．solution | C．subject | D．sign |
Jordan kept his illness from his opponents before the final game ________ they might know about it.
| A．now that | B．on condition that | C．for fear that | D．in order that |
The order of DNA chemicals ________ whether a child has her mother’s eyes or her father’s smile.
| A．delivers | B．designs | C．denies | D．determines |