—Why did you arrive late? —The fog _____ our air flight for about half an hour.
—Sorry, I didn't catch you. —Be quiet, please; the baby ________.
—What happened? I called you several times yesterday evening, but I couldn't get through. —Sorry, my sister and I ________ on the phone all the time.
—Do you love teaching, Miss He? —I fell in love with teaching in 2000. I ________ for twelve years by this summer.
Kate ________ on her new novel, which is supposed to come out next month.
My parents ________ in Hong Kong. They were born there and have never lived anywhere else.