I phoned my first teacher time and again when I heard that he was ill, yet couldn’t_______

Our radio show is from twelve o’clock night to six o’clock in the morning.

ne had a form in his hand,but no one knew which office____

In the end , he turned ______history teacher, who had______ good knowledge of history, especially ______ history of ______Ming Dynasty.

Could you teach me how to use the computer —___________.