4. (watch ) _________by a crowd of people, charles felt embarrassed and couldn't say a word.
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By the time he retires next year, he (work ) _________for the company for 30 years.
6. I've heard that the musical group wil set off for Shanghai to give a three-day (perform )_________.
8. George's father was angry when he knew the young cherry tree ( cut ) _________down.
The girl is too weak to (assign)_________such heavy work .