Only when they were put in prison and lost freedom(自由) _________ its importance.
| A．they realized | B．did they realize |
| C．realized they | D．had they realized |
They considered the plan in all its ______.
| A．appearances | B．aspects | C．prospect | D．suspect |
Niagara Falls is a great tourist ______，drawing millions of visitors every year.
| A．attention | B．attraction |
| C．appointment | D．arrangement |
You have been sitting on my hat and now it is badly out of______.
| A．date | B．shape | C．order | D．balance |
Look at the terrible situation I am in！If only I ______ your advice.
| A．follow | B．had followed | C．would follow | D．have followed |
______ achievement，last week's ministerial meeting of the WTO here earned a low，though not failing grade.
| A．In terms of | B．In case of | C．As a result of | D．In face of |