When ________ to danger and conflict, men tend to increase blood pressure, ________ nervous and anxious.
| A．exposed; felt | B．exposed; feeling | C．exposing; feeling | D．exposing; felt |
The time is drawing near food raised in space will directly benefit human below.
| A．where | B．when | C．whether | D．why |
Electrical products no longer in use contain dangerous materials which can be released into the environment when they are _____.
| A．taken apart | B．given away | C．fixed up | D．handed over |
There can be little doubt _____ bombing Libya would drive thousands more to take up arms.
| A．why | B．Whether | C．that | D．How |
The train was crowded and I had to get into a carriage _______ there were already seven other passengers.
| A．which | B．where | C．what | D．when |
_______you write on a subject,you join in an ongoing, trans-historical conversation with others who have written about your topic.
| A．No matter what | B．Wherever |
| C．Whenever | D．No matter how |