14．This doubt had been in my mind for some time, but the research still went on____some reasons.
| A．to | B．about | C．for | D．In |
The reason _______ he was late was _______ he missed the bus.
| A．why, because | B．why, that | C．that, why | D．because, why |
The tiger, once a ____ animal to humans, is now ____of disappearing on the earth.
| A．dangerous, danger | B．in danger, in danger |
| C．dangerous, in danger | D．danger, in danger |
That hotel is always full because it offers a friendly____and personal service.
| A．adventure | B．award | C．atmosphere | D．appearance |
---Did you watch the programme I’m a singer on Friday night? It was wonderful.
---I wish I had, but I _______for the mid-term examination.
| A．was preparing | B．prepared | C．had prepared | D．would prepare |
It remains a question_______we can finish the project in such a short time.
| A．what | B．that | C．how | D．when |