At minus 130℃, a living cell can be ______ for a thousand years.
Though he failed, he tried _______ it again and again.
You didn't hear us come back last night. That's good. We tried ______ noisy.
Remember ______ the book, when you have finished it.
Some people's greatest pleasure is ______ .
. It's very kind ______ you ______ say so.