The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
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.
Would you please keep silent? The weather report ________ and I want to listen.