Shanghai, China’s biggest and the most dynamic city, which______ in the Yangtze River Delta, is playing a leading role in the country’s economy.
29. I have been absent for nearly half a month. I can't afford ________ week.
28. The officer was very concerned ________ the latest development in the case because he was concerned ________ it.
27. If we ________ to him, he will make further demands.
26. Parents always tell us not to stay ________ there is danger.
25. – Tom, it's too late. Our son ________ be back. – Don't be anxious. I dare say he ________ have some extra work to do.