Since he has just had a major operation, he knows that a trip to Europe this summer is __________.
The political situation in Libya will become even worse unless some measures ______.
The flight was put off due to the typhoon. Otherwise, we______ the beautiful scenery in Greece now.
We are living in an age ______ we treasure very much, because it sees man’s rapid development.
These comments are not directly ______ to the inquiry about safety standards.
______ to nuclear radiation, even for a short time, may influence genes in human bodies.