精选优质文档-倾情为你奉上1. He is upstairs _ letters. A. writes B. is writing C. write D. writing2. _ more attention, the trees could have grown better. A. Given B. To give C. Giving D. Having given 3. The secretary worked late into the night, _ a long speech for the president. A. to prepare B. preparing C. prepared D. was preparing4. The next morning she found the man _ in bed, dead. A. lying B. lie C. lay