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?” “No, I have ________ seen it.” 5. “Has the bus left _______?” “Yes, it has _________ left.”