填空题 Some of the following extracts from a transport company's annual report contain mistakes with tenses. If the sentences is correct, mark it with a √. If the wrong, correct it.
2007 {{U}}has been{{/U}} a better year than we had originally anticipated. was
At the beginning of the year we {{U}}won{{/U}} a contract to build a new metro system in Singapore. √
填空题 Even though revenue was down over the course of the year, our profit margins {{U}}improved{{/U}}. ______
填空题 In April we {{U}}had begun{{/U}} work on a bus terminal in Shanghai. ______
填空题 In Shanghai we used the same design that we {{U}}used to use{{/U}} in Beijing a year earlier. ______
填空题 Because many existing projects {{U}}were coming{{/U}} to an end, we made it a priority to look for new business. ______
填空题 In May, a new head of International Business {{U}}has been{{/U}} appointed. ______
填空题 We found that we {{U}}wasted{{/U}} a lot of time in the planning stages. ______
填空题 The official opening {{U}}was{{/U}} attended by the President of Iran. ______
填空题 Our R & D department {{U}}was working{{/U}} on a new high speed railway which will be launched next year. ______