I have a really bad headache, and I have to ________ a doctor about my pains.
Expo 2010 Shanghai China will offer ____ wonderful opportunity for ____ cross - culture dialogues.
We walked as fast as we could,____ to catch the 9:30 train.
-- I saw Mr Li at the meeting yesterday. --- Did you? He ______ have attended, for he had asked for sick leave.
. Tom said he had been working for three hours, ________, evidently, was untrue.
. He wasted a lot of time playing football, otherwise he ________the exam.