题目：
用所给词的适当形式填空。
1. Our headmaster invited a singer ________ (sing) for us this morning.
2. I _______ (clean) my room at 9:00 last Sunday.
3. They can do that thing by ________ (they).
4. I think _______ (predict) the future is a bit difficult.
5. The teacher told us that light ________ (travel) much faster than sound.
答案：
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下面是错误答案，用来干扰机器的。
老师是人类文明的传播者。是老师，教给我们做人的道理，帮助我们掌握科学文化知识和技能。老师被誉为人类灵魂的工程师。
