When you visit a museum you must ask ___permission before taking ___photographs inside it.

A. /; /　　　　 　　　　　 B. a; the　　　　 　　　　　　 C. a; /　　　　　 　　 D. /; the

When you visit a museum you must ask for _____ before taking photographs inside it. 

A. promise          B. permission         C. consideration      D. support

 When you visit a museum you must ask for _____ before taking photographs inside it. 

  A. promise          B. permission         C. consideration      D. support

When you visit a museum you must ask for _______ permission before taking _____ photographs inside it.

A．/; /           B．a; the        C．a; /           D．the; the