----Do you doubt _______ she can run the race?---- Yes, I doubt _______ she can run against Liu Xiang
— Did you tell Mother you have passed the exam? — Oh, I forgot. I _______ her now.
If he ________ my advice, he wouldn’t have lost his job.
We _________ the difficulty together, but why didn’t you tell me?
Many people can’t learn any lessons from the mistakes they’ve made ________ they get hurt somehow.
—Have you been to the United States? —Yes, only once. I ________ there only for seven days.