在缺词处加一个漏词符号（/\）,并在该句下面写出该加的词。
删除：把多余的词用斜线（\）划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1. 每处错误及其修改均仅限一词；
2. 只允许修改10处，多者（从第11处起）不计分。
It was raining. In his way home from school Peter saw an old man walking with difficult in the rain without a umbrella. Peter went up to him and offered share the umbrella with him. The old man in poor health, so Peter tried to hold the umbrella. But he was so short to hold it high enough. While wondered what to do, he saw the old man's stick and had an idea. He had tied the stick to the handle of the umbrella and made them longer. Now we shared the umbrella. Peter was happy.
和缺失，戴义齿后咬舌。最可能的原因是（）
平面偏高