Don’t promise anything ______ you are one hundred percent sure.
It was at 5 o’clock __________ the visitors finally arrived at Pudong International Airport.
—Have you ________ him to give up the job?—Yes,I have. But he doesn’t listen to me.
Rather than _______ on a crowded bus, he always prefers________ a bicycle.
I can still remember ______ it was so long ago.
It was the first time that I __________ the night face to face.