下列每个句子中均有一处错误，请找出并改正。

小题1: We don’t know that we can do about it.

小题2:Could you tell me how I could get to the nearest post office?

小题3:The old man said he had joined the army in 1965.

小题4:Mary said she did not heard from her old classmate since September.

小题5: Charles asked he could use my car.

小题6:Mother asked me where I will go the next day.

小题7:Do you have a friend whom you could tell everything, like your deepest feelings and thoughts.

小题8:Don’t look at someone else paper, John. You should do it by yourself.

小题9: In order to improve your English, you can try writing an English diary every day.

小题10: The teacher gave a series of example in her lecture in order that everybody could understand.

民事法律行为，是指公民或者法人设立、变更、终止民事权利和民事义务的合法行为，下列属于民事法律行为的是( )

A．某施工企业被迫与工程所在地的一家劳务公司订立一份高于市场价的砂子运输合同
B．某施工单位委托一工程咨询公司负责项目的索赔服务
C．为了谋取中标，某施工单位与一开发企业订立一份合作开发合同
D．某分包单位在未征得总包单位同意的情况下，将工程再次分包