—— ______ you got to know I traveled to the USA?——Through one of your colleagues.
—Can I go out to play, Mom? —You can ______ you stay in the garden.
All people, ______ they are old or young, rich or poor, have been trying their best to help those in need since the disaster.
______ he works hard,I don't mind when he finishes the experiment.
I could ______ he was surprised from the expression on his face.
—Shall I turn down the radio a little bit? —______ . I’m quite used to working with the radio ______ the music.