23.The universities have got bigger in size, ____ many more people the chance of higher education.
| A．so allowing | B．thus allowing | C．so to allow | D．thus to allow |
Young people may risk ________ deaf if they are exposed to very loud music every day.
| A．to go | B．to have gone | C．going | D．having gone |
I have no idea ________ the cell phone isn’t working, so could you fix it for me?
| A．what | B．why | C．if | D．which |
The students are looking forward to having an opportunity ________ society for real-life experience.
| A．explore | B．to explore | C．exploring | D．explored |
The judges gave no hint of what they thought, so I left the room really ________.
| A．to be worried | B．to worry | C．having worried | D．worried |
They promised to develop a software package by the end of this year, ________ they might have.
| A．however difficult | B．how difficult |
| C．whatever difficulty | D．what difficulty |