根据句子意思，用括号中所给词的正确形式填空，每空一词。

1. The young man was too late, but              (luck), he caught the train.

2. I felt bored because of this              (bore) story.

3. If you do more exercise, you will be              (slim).

4. She is one of the best              (run) in our school.

5. The dish             (tasty) very nice.

某居民院内月底统计用电情况，其中3户用电45度，5户用电50度，6户用电42度，则平均每户用电[ ]

A.41度

B.42度

C.45.5度

D.46度