They ____two free tickets to Canada, otherwise they’d never have been able to afford to go.

下列腺体分泌的消化液中，消化酶种类最多的一组是（    ）

抓关键词是历史学习的方法之一。与“1954年”“第一届全国人民代表大会”“民主政治建设”等关键词相吻合的历史事件是（     ）

如果$\frac{2}{1-i}=1+mi$（$m\in R$，i表示虚数单位），那么m=(   )

完形填空
    A little girl lived in a simple and poor house on a hill. Usually she 1 play in the small garden. She could see over the garden fence and across the valley a wonderful house with shining golden windows high on another hill.2 she loved her parents and her family, she desired to live in such a house and 3all day about how wonderful and exciting 4must feel to live there.
    At the age when she gained some 5 skill and sensibility (识别力), she 6 her mother for a bike ride 7 the garden. Her mother finally allowed her to go，8 her keeping close to the house and not  9 too far. The day was beautiful. The little girl knew10 where she was heading!11 the hill and across the valley, she rode to the 12 of the golden house.
    13 she got off her bike and put it against the gate post, she focused on the path14to the house and then on the house itself.She was very disappointed when she 15 that all the windows were 16 and rather dirty.
    So 17and heart­broken, she didn't go any further. She 18 ， and all of a sudden she saw an amazing 19. There on the other side of the valley was a little house and its windows were golden. Looking at her little home, she20 that she had been living in her golden house filled with love and care. Everything she dreamed was right there in front of her house.