Bob tried to sweet-talk his mother into letting him go out. But when he saw his sweet talk________， he lost his temper. 

I didn’t hear the telephone ringing. I _____.

—How long on earth shall I have to wait?—Sorry, sir. Just a minute. There ________ a table available.

Experiments of this kind ___in both the U．S and Europe well before the Second World War．

When their first child was born, they _________ for three years.