\(\left(\frac{a+\sqrt{a}}{\sqrt{a+1}}-\frac{\sqrt{a}-1}{a-\sqrt{a}}\right):\frac{\sqrt{a}-1}{a}\)

\(\sqrt{\left(2+\sqrt{7}\right)^2}-\sqrt{\left(2-\sqrt{7}\right)^2}\)

Preceding by four nice children, the bride and the groom entered the wedding hall.

A. Preceding                  

B. children            

C. the                             

D. entered