根据汉语提示用正确的词或短语完成句子。

1.Mr Liu_______ (创立)his own company in September, 2010.

2. ________ (广告)are seen everywhere now.

3. Li Huiping and Lan Pei are good_______ (志愿者).

4. Mr. Green is our football_______ (教练).He_______ (教授)us every day.

5. How many_______ (基础的)schools are there in your town?

单轴应力状态下与主应力垂直的面上（）。

A、有直应力又有剪应力

B、只有剪应力

C、只有直应力

D、既无直应力又无剪应力