five（）seven makes twelve用add up,add to或add up to的正确形式填空顺便讲下三个词各是什么用法+分

five（adds）seven makes twelve
1.add up 总计
eg.Every time I add these figures up,I get a different answer.每次我把这些数字加起来,总有一个不同的答案.
2.add to 增加,增添
eg.This adds to our difficulties.这会增加我们的困难.
3.add up to 合计为
eg.The expenses add up to 100 yuan.支出合计为100元.