(江苏省南通市2009期末调研)I don’t think that your lecture _______ the audience, for they appeared quite puzzled.

I haven’t heard from Bill ______he left here.

It is playing computer games _____spends so much time that he fails all the exams.[ ]

I don’t know why Tom was absent from yesterday’s meeting.—He must have been sick, _______？

Yesterday I _______ my umbrella at home. So I had to take ___________.