____ I want to know is ____ I can master English in the shortest possible time.

______ made the school proud was ____ more than 90% of the students had been admitted to the key universities.

—The problem is _______we are short of money.

The reason_________ he was late for work was_________ he didn’t get up early.  

---I’ll ask the teacher about past tense. I’m very puzzled about it. --- That is just _____ most of our classmates have doubt.