发包人需变更增加的设计内容专业性特点较强，发包人经( )书面同意后，可委托其他具有相应资质的建设工程勘察、设计单位修改。

A．总监理工程师

B．原建设工程设计人

C．施工承包人

D．原审批机关

根据句意和汉语注释，写出单词的正确形式。

小题1:The famous person often makes some ______________ (演讲)on protecting wild animals.

小题2:He feels happy by ________ (志愿) to work for the charity.

小题3:They have no money to afford________________(医学) treatment

小题4:They are very interested in these ________(发明).

小题5:He _________(表演) so wonderfully yesterday.