.
__________ about wild plants that they decided to make a trip to Madagascar for further research.
| A．So curious were the couple | B．So curious the couple were |
| C．How curious the couple were | D．The couple were such curious |
I don't believe we've met before,__________ I must say you do look familiar.
| A．therefore |
| B．although |
| C．since |
| D．unless |
The old man asked Lucy to move to another chair __________ he wanted to sit next to his wife.
| A．although |
| B．unless |
| C．because |
| D．if |
I'm sorry you've been waiting so long, but it'll still be some time __________ Brian gets back.
| A．before |
| B．since |
| C．till |
| D．after |
It just isn't fair __________ I was working as a waiter last month, my friends were lying on the beach.
| A．whenever |
| B．though |
| C．for |
| D．while |
—Are you ready for Spain?
—Yes, I want the girls to experience that __________ they are young.
| A．while |
| B．until |
| C．if |
| D．before |