It is believed that this stamp is________; all others like it have been lost or destroyed. [ ]

The army has _____ grain. They are in a very difficult situation.

the college entrance exam is drawing near, study shouldn’t take up all of your time. It’s important to some time for relaxation and hobbies as well.

He has behaved in thonnost extraordinary way;I can’t hisactions at all

下与好朋友打招呼要说______.