--The river used to be clean. How does it become dirty? -- There are many factories ________ waste water into it. A. pouring B. pour C. poured
—____ your sister know Tom? —No, she ____.
—Hi, Lucy. Your skirt is very nice. —____
James is an English boy. He _____ from England.
My name ____ Jack. Liu Ying and Sun Mei ____ my friends.
—____ are you? —I’m twelve.