问题详情：
词汇运用；根据句意，用括号中所给词的正确形式填空，每空填一词。
1. The speech given by the expert is worth ▲ (listen) to.
2. We must send the poor man to hospital because he was ▲ (terrible) ill.
3. My grandfather ▲ (prefer) to live in the quiet country after he became old.
4. A space sleeping bag is used to be fixed to the walls to prevent ▲ (float).
5. A witness reported the suspect was ▲ (breath）heavily and had blood on his shirt.
【回答】
en ibly 3. preferred ting 5. breathing
知识点：构词法
题型：完成句子
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