_____ environmental damage is done does it take many years for the ecosystem to recover.
| A．Even if | B．While | C．Only if | D．Once |
People are very adaptable, and we quickly ______ a new life circumstance — for better or worse — and consider it normal.
| A．adjust to | B．lie in | C．stay with | D．rely on |
A firm, dry handshake is generally regarded as an indication that someone is confident and ______.
| A．in control | B．in style | C．in place | D．in office |
A unique ______ of these rock shelters was that they were dry.
| A．feature | B．function | C．symptom | D．Pattern |
I think it’s time the police got ______ with people who drink and drive.
| A．sweeter | B．tenser | C．rougher | D．Tougher |
I have learned a lot about Asian customs, ______ in the small village for three years in the early 1990s.
| A．lived | B．to live |
| C．having lived | D．to have lived |