按照下面各题的汉语意思用英语完成句子，词数不限。

1. 从美国回来后，她还不时与房东在网上聊天。

   She chats with her host over Internet ________ after she came back from the USA.

2. 地震中受灾的孩子需要很多帮助，但最重要的是爱。

    The children who have suffered from the earthquake need plenty of help, but ________ they need love.

3. 免费塑料袋不再提供后，人们购物时要么自带袋子，要么花钱购买。

     Without free plastic bags offered, people either take their own bags ________ bags when they go shopping.

4. 我市政府设法确保本地儿童都能享受免费九年义务教育。

     The government of our city tries ________ that local children can enjoy a nine-year compulsory

    education for free.

5. 人们将永远记住那小女孩身处危险时的甜美微笑。

     The little girl ________ for ever by people for her sweet smile when she was in danger.

利用高速通信网络将多台高性能工作站或微型机互连构成机群系统，其系统结构形式属于（）计算机。

A．单指令流单数据流(SISD)

B．多指令流单数据流(MISD)

C．单指令流多数据流(SIMD)

D．多指令流多数据流(MIMD)