例题：
1. Because of her bike _______, she has to walk to school.
A. was stolen B. being stolen
2. Because her bike _______, she has to walk to school.
A. was stolen B. being stolen
解析：
B。because of为介词，其后的结构不是句子，故不选谓语单词/时态，因为谓语单词/时态即意味着句子。
A。because为引导词，其后的结构为句子，故选择谓语动词/时态的形式。
练习：
1. I can’t do my homework with all this noise _______ on.
A. is going B. going
2. I can’t do my homework when all this noise ______ on.
A. is going B. going
答案：
B，with为介词，其后非句子，不选时态。
A， when为引导词，其后为句子，选时态。
写作：
因为降雨的减少，雾霾天气越来越多。
Because of the decrease of rainfall, there is more and more smoggy weather.
或：Because rainfall decreases, there is more and more smoggy weather.
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