open的形容詞是？

　　Children need to play out in the open.

　　孩子需要在戶外玩耍。

　　The new store will be open in the spring.

　　新商店將在春天開業。

　　The agreement will open the door to increased international trade.

　　此協議將會提供增加國際貿易的機會。

　　This new job could open up whole new vistas for her.

　　這項新工作可能給她開辟全新的前景。

　　The new sports complex is on target to open in June.

　　新建的體育中心將在六月份如期開放。