[解析]
1.business.考查名词,on a business trip:出差,固定搭配,故填business.
2.Seeing.考查非谓语,my mother与see是主动关系,故填现在分词做状语,故填Seeing.
3.wishing.考查非谓语,I与wish是主动关系,故填现在分词做状语,故填wishing.
4.had been.考查时态,this was the first time that结构中使用was,故从句中使用过去完成时,故填had been.
5.Unfortunately.考查副词.用副词Unfortunately修饰句子my mother caught a cold the next morning as a consequence of cold weather.表示"不幸的是".故填unfortunately.
6.experienced.考查动词,该句中缺少谓语动词,因为是过去时,故填experienced.
7.as.考查连词,正如我像父亲保证的那样,引导定语从句,故填as.
8.better.考查比较级,感觉好多了,表示比较,故填better.
9.That.考查连词,that引导主语从句,因为从句中不缺少成分,故填That.
10.what.考查连词,what引导宾语从句,因为从句中缺少宾语,故填what.