___ he did it remains a secret

Everyone here likes Mike because he is good at telling and _______ jokes.

It’s only when he reached the tea-house that _____it was the same place he’d been in last year.

The good thing about children is that they________ very easily to new environments.

But for the bird flu ( 禽流感 ) in Vietnam in the summer of 2004，I ______ you to go to Vietnam for sightseeing. — Really？ What a pity！