补全句子(1)这孩子费了很大劲计算那道数学题The ___ had problems ___ ___the math ___.(2)Sam已连续滑冰两小时,对吗?Sam ___ ___ ___ for two hours,___ ___?(3)老师鼓励我们对理科感兴趣The teacher ___us ___ ___an___

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补全句子
(1)这孩子费了很大劲计算那道数学题
The ___ had problems ___ ___the math ___.
(2)Sam已连续滑冰两小时,对吗?
Sam ___ ___ ___ for two hours,___ ___?
(3)老师鼓励我们对理科感兴趣
The teacher ___us ___ ___an___ ___science

1.child,working out,problem.
2.has kept skating,hasn't he
3.encourages,to have/draw/form,interset in