1.________ ________the disturbing news that dolly had become seriously ill.
接着传来了多莉病重的坏消息。
2．however，the problem________she later developed a serious lung disease bothered scientists.
但是，她后来得了严重的肺病，这个问题让科学家们感到烦恼。
3．________would be unfair to clone any extinct animals if they were to live in a zoo.
如果(被克隆后)只能生活在动物园里，克隆任何绝种动物都是不公平的。
4．you might________this hard at first but it pays off when you come to speak.
你可能在开始时觉得困难，但当你说起来了，你会觉得很值得。
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