Without the 
air to hold some of the sun’s heat, the earth at night ____ for us to live.
| A．would be freezing cold | B．will be freezing coldly |
| C．would be frozen cold | D．can freeze coldly |
You will succeed in the end________you give up halfway.
| A．even if |
| B．as though |
| C．as long as |
| D．unless |
The WTO cannot live up to its name________it does not include a country that is home to one fifth of mankind.
| A．as long as |
| B．while |
| C．if |
| D．even though |
I was advised to arrange for insurance________I needed medical treatment.
| A．so that |
| B．in case |
| C．although |
| D．however |
You will be late________you leave immediately.
| A．unless |
| B．until |
| C．if |
| D．or |
—What time do you start work?
—It________.
| A．decides |
| B．varies |
| C．turns |
| D．becomes |