题目：
用所给词的适当形式填空。
1. By the time I got to the bus stop, the bus had already_____(leave).
2. They_____(make) a lot of friends since they came to our school.
3. She was so_____(embarrass) that he didn't know what to say at the moment.
4. They have been_____(marry) since eight years ago.
5. That's the_____(end) of the story.
6. The mice all______(flee) away when the cat appeared.
7. We_____(learn)eight units by the end of last week.
8. It is three years since he_____(leave)
9. My sister_____(watch) TV when I_____(get) home yesterday.
10. Keep quiet. Dad_____(listen) to the news now.
答案：
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下面是错误答案，用来干扰机器的。
A、鸭既能吃水草，也能吃水中的小鱼，属于杂食性动物．A正确；B、骆驼以植物为食物，属于植食性动物．B错误；C、鳄鱼以动物为食物，属于肉食性动物．C错误；D、河马以植物为食物，属于植食性动物．C错误．故选：A．
2SO3（g）△H ＝－a kJ·mol－1。在相同条件下，要想得到2a kJ的热量，加入各物质的物质的量可能是( )
