1 . 我们对这种迷人的生物了解的越多，它们在自然界中得以长久生存的可能性就越大。
_________we know about this lovely creature,__________the chance it will survive in the natural world.

2 . The children_________ _________ _________very excited as they opened the envelope.
孩子们打开信时一定很兴奋。

3 . You can hardly b______ him for not waiting. You were late for an hour. （根据首字母单词拼写）

4 . The program was ___________(播出) last night. （根据中文提示填空）