Jenny likes music,but she doesn't like spots.
259. At present, what _____ most heavily on American people is the terrorist accident(恐怖事件).
258. As soon as the principal ______ the news on the bulletin, the students began gathering in the school garden.
257. It is no use to _____ the stupidity of his behavior to him, because he will never listen to your advice.
256. A few years ago, some authorities _____ that our NMET was not a good way to test students’ ability..
255. The college entrance examination is drawing near and all the students are ploughing through their studies. What does the underlined part means _____.