At minus 130℃, a living cell can be ______ for a thousand years.
| A．spared | B．protected | C．preserved | D．developed |
---Excuse me, has the train from Beijing arrived yet?
--- ________, you are three quarters earlier. It's only 9 now.
| A．Unconsciously | B．Instantly |
| C．Absolutely | D．Actually |
The speed limit for bicycles on campus is 15 mph, ___________ otherwise posted.
| A．unless | B．until |
| C．since | D．however |
In manufacturing, cheaper materials are constantly being for the better, more expensive kind.
| A．maintained | B．cancelled |
| C．substituted | D．deposited |
I have no idea of what is in fashion nowadays, so my choice might be quite ____.
| A．abundant | B．arbitrary |
| C．considerate | D．aggressive |
Every time Gina catches her employees ____________ time, she reminds them that time is money.
| A．to waste | B．wasting |
| C．wasted | D．waste |