It’s clear__________ that a hard working student has___________ a great interest in science.
| A．不填; discovered | B．不填; developed |
| C．that; invented | D．that; developed |
Before you decide to leave your job, _______ the effect it will have on your family.
| A．consider | B．considering |
| C．to consider | D．considered |
The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun |
| C．beginning | D．begun |
I felt it a great honour ______ to speak to you.
| A．to ask | B．asking |
| C．to be asked | D．having asked |
“What do you think made Mary so upset?” “_______ her new bike.”
| A．As she lost | B．Lost |
| C．Losing | D．Because of losing |
When you’re learning to drive, _______ a good teacher makes a big difference.
| A．have | B．having |
| C．and have | D．and having |