Diamond, _________, is the hardest of all materials.
| A．like we know | B．since we know | C．we know | D．as we know |
The party will be held in the garden, weather .
| A．permitting | B．to permit |
| C．permitted | D．permit |
Mary is really good at taking notes in class. She can almost every word her teacher says.
| A．put out | B．put down |
| C．put away | D．put together |
The result is not very important to us, but if we do win, then so much _______.
| A．the best | B．best |
| C．better | D．the better |
I don't believe we've met before, I must say you do look familiar.
| A．therefore | B．although |
| C．since | D．unless |
It is by no means clearthe president can do to end the strike.
| A． | how | B． | which |
| C． | that | D． | what |