He is a teacher. He has been a teacher ____ 1990.
—What class are you in? —I’m in ____, ____.
—____ your sister know Tom? —No, she ____.
—Hi, Lucy. Your skirt is very nice. —____
—Can you give this book ____ Jack? —Yes, I can.
My name ____ Jack. Liu Ying and Sun Mei ____ my friends.