She tried to stay calm on the stage, but her trembling voice _______ her                                      nervousness.

A．gave away

B．gave up;

C．gave off

D．gave out

书刊出版单位委托印刷企业印刷书刊，应当按照国家有关规定向印刷企业（）。

A.提交印刷材料

B.提交印刷委托书

C.按估计工价总额的30%支付定金

D.出示著作权登记证明