-------------------6、 We could not find the book in spite of our search.(periodic sentence) 参考答案: In spite of our search,we could not find the book. In spite of our search,we could not find the book.----------------------------------------7、 The bridge had been weakened by successive storms.It was no longer safe.(simple sentence) 参考答案: Having been weakened by successive storms,the bridge was no longer safe. Having been weakened by successive storms,the bridge was no longer safe.----------------------------------------8、 Opening the drawer,Bill took out some papers.(compound sentence) 参考答案: Bill opened the drawer and he took out sorne papers. Bill opened the drawer and he took out sorne papers.----------------------------------------9、 The manager is going to some place,but no one knows.(complex sentence) 参考答案: No one knows where the manager is going. No one knows where the manager is going.----------------------------------------10、 When Mary was on vacation,her friends asked her to drop her a line.(compound sentence) 参考答案: Mary was on vacation。and her friends asked her to drop her a line. Mary was on vacation。and her friends asked her to drop her a line.
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