根据下列各句句意及所给单词的首字母或汉语提示，用正确形式的单词填空。
【小题1】I can see many beautiful Christmas decorations (装饰) on the streets.
【小题2】She was always optimistic (乐观的), even when things were at their worse.
【小题3】A cinema is a public place of entertainment (消遣).
【小题4】He prefers going on with his work to retiring (退休).
【小题5】He is to be congratulated (祝贺) for his success.
【小题6】It is reported that an aircraft ccrashed near the city but luckily no one was killed.
【小题7】Little Tom wrote “Granny, Heaven” on the eenvelope , and then gave it to his father to post.
【小题8】A few of the students failed in the examination, you iincluded .
【小题9】I don’t know if we can help – that ddepends .
【小题10】The doctor had to cut off his left leg and fix an aartificial leg for him.
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解析：
【小题1】decorations 根据上文的many说明这里使用复数形式。
【小题2】optimistic 形容词乐观的：optimistic
【小题3】entertainment 名词娱乐entertainment，由动词entertain娱乐转换而来。
【小题4】retiring 考点固定结构prefer doing A to doing B 宁愿做A而不愿做B。
【小题5】congratulated 动词祝贺congratulate。根据句意说明使用被动的形式。
【小题6】crashed 动词crash撞击；坠毁。
【小题7】envelope 根据write说明写的是信件，所以是在信封上写。
【小题8】included 动词include包括；you与include构成被动关系，故使用过去分词的形式。
【小题9】 depends 固定词组it depends视情况而定
【小题10】artificial 根据上文的cut off his left leg说明是把腿切除，如何撞上假肢，人造的artificial