填空题
一位男老师正在教一位学生打篮球，话题中谈到学生妈妈。A：What is your mother’s （46）（47）？B：（48）favorite （49）is playing basketball．A：Why （50）she like playing basketball？B：Because （51）very interesting．A：Who is （52）basketball （53）？B：（54）basketball teacher （55）Mr Smith．
A． sell ;toB． buy ;fromC． sell ;fromD． buy ;to
A．It's 10 yuanB．It's 10 yuansC．They're 10 yuanD．They're 10 yuans