At the beginning of class, the noise of desks _____ could be heard outside the classroom.

A．opened and closed

B．to be opened and closed

C．being opened and closed

D．to open and close

古诗文填空。（五题任选做四题）（8分）

（1）                   ，知来者之可追。                   ，觉今是而昨非。

（2）                ，响穷彭蠡之滨；雁阵惊寒，                      。（3）                    ，                       。俨骖騑于上路，访风景于崇阿。

（4）                  ，                。臣不胜犬马怖惧之情，谨拜表以闻！

（5）诏书特下，                  。寻蒙国恩，                  。