Thecleverboymadeaholeinthewall,_____hecouldsee_____was goingoninsidethe house.

We can’t work out the physics problem. Can you tell us________

It was ________ of our boss to care so much about our feelings, as a result of which many of my co-workers decided to stay when our company was at risk.

The spokesman did not give out the details of the message, saying, “it should not be made public as it is a ______ issue”．

What a pity! Considering his ability andexperience，he___better．