句子：1. He became rich. 他变得有钱了。2. What are these for? 这些是做什么用的？3. It's your move. 该你了。4. The plants died for lack of water. 这些植物因缺水枯死了。5. We received an acknowledgement of our letter. 我们收到了一封确认信。6. We had much difficulty in finding the bus stop. 我们费了很大劲才找到公共汽车站。7. Sally has been on a diet since last month. 莎莉从上个月开始一直在节食。8. It has become quite autumnal. 秋天到了。9. Of these two opinions, I prefer the latter to the former. 在这两种观点中，我更喜欢后者。10. There are footprints of a cat on the table. 桌子上有一只猫的脚印。
