_______ is responsible for this accident will be punished.
Tom had tothe invitation to the party last weekend because he was too busy.
Despite the previous rounds of talks, no agreement______ so far by the two sides.
______ for two days, Steve managed to finish his report on schedule.
I ______ have worried before I came to the new school, for my classmates here are very friendly to me.
Jane can’t attend the meeting at 3 o’clock this afternoon because she ______ a class at that time.