Every day ____ a proverb aloud several times until you have it memorized.
—— I will come to attend your lecture at 10:00 tomorrow. —— I’m sorry, by then my lecture will have ended and I___my guests in my office.
Do you have any idea ______ is actually going on in the classroom?
I was surprised by her words,which made me recognize ______ silly mistakes I had made.
Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
The old lady’s hand shook frequently.She explained to her doctor ______ this shaking had begun half a year before, and, ______ only because of this, she had been forced to give up her job.