It (sudden)______occurred to her that Joe was afraid of being alone.
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Why is it impossible to use the new technique to search for life in other solar systems now?
熊彼特是第一个认识到创新对经济增长的重要作用并提出创新概念的学者。()
美国谷歌公司自2004年开始对图书进行大规模数字化,在没有获得授权的情况下,将全球尚存有著作权的近千万种图书收入其数字图书馆,这属于侵权。()
What do the buyers ask the sellers to do unconditionally?
To _______________________________.