Can you explain ______ the OPEC can have such total control over the price of oil?
—I’m sorry. I wasn’t helpful when you were in trouble. —Oh, ________. In fact, you did help me a lot.
—What are you busy with ? —The conference _______ in our city next week.
_________ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected.
The United Nations Educational, Scientific and Cultural Organization (UNESCO) officially _________ Chengdu to join its “Creative Cities Network”, making it the second city in the world and the first city in Asia
My uncle now teaches French in a famous domestic university, who _____ in Paris for 6 years.