二、用“never, ever, already, just, yet, for, since”填空1. I have _______ seen him before, so I have no idea about him.2. Jack has _________ finished his homework.3. Mr. Wang has taught in this school ________ ten years.4. “Have you ________ seen the film?”5. “No, I have ________ seen it.”6. “Has the bus left _______?”7. “Yes, it has _________ left.”