1. 我用了两个小时修车.
    It __________ me two hours __________ __________ the bike.
2. 直到妈妈回来时,他才完成作业.
    He __________ finish his homework __________ his mother came back.
3. 他和我都不是老师.
    __________ he __________ I am a teacher.
4. 他从小就对数学感兴趣.
    He became __________ in maths when he was __________.
5. 你最好乘火车.
    You'd __________ __________ a train.