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用所给词的适当形式填空。 1. Our headmaster invited a singer ________ (si

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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.
1. to .sing
2. was cleaning
3. themselves
4. predicting
5. travels