Where is my pen? —Oh, sorry, I have taken________ by mistake.

When I saw children working for a cruel boss, I felt sorry ______ them. [ ]

Did you say goodbye to Anna?— Yes .When I _____ to say goodbye to her, she ______ the piano.

Is there ________ wrong with your TV?

Who do you intend to have______your computer? —– I haven’t decided yet. I wonder if you could help me。