In that country, guests usually feel that they are not highly ________ if the invitation to a dinner party is given only three or four days before the party date.

A．regarded　　

B．thought　　　

C．admired　　　

D．concerned

校园内有一株法国梧桐，它是由_____、_____、_____、_____、_____和_____六种器官组成的，但它的发育则是从一个_____分裂开始的。