国际奥林匹克委员会已经决定第31届奥运会于2016年在里约热内卢举办。这个组织的英文简写是_________.
–What are the rules?–We must keep our hair _______, and we must wear the school uniform.
Jill and Anna were tired, but _______ of them stopped to have a rest.
Which of the following signs can we most probably see in a museum?
–_______ is it from here to the airport?–About forty kilometers.
–Will the air in our city get cleaner?–_______. Everybody likes clean air.