求高手翻译句子（中-英），要用到括号里的词，翻译器的不要，谢谢！

1. What on earth has happened that she appeared to be so sad? 发生什么事了，她怎么显得如此悲伤？on earth是固定词组来强调到底的意思。

2. She monthly sets aside some money to buy a house. 为了买房，她每个月都会留出一些钱. 句用的是一般时态， she是第三人称单数所以set后加了s, 为sets

3.Burning fossile fuels releases a great deal of carbon dioxide into the earth's atmosphere. 燃烧化石燃料释放了大量的二氧化碳到地球的大气中。a great deal of 大量

4。 他期待着假期的来临，他可以回家看望父母。He is looking forward to the vacation for he can go back home to visit his parents.

1. What happened? She appears to be so sad. 或 She appears to be so sad. What happened to her?
2. In order to buy a house, she sets aside some money on every month.
3. Burning fossil fuel releases a mass of carbon dioxide in the atmospheric on earth.
4. He looks forward to his vacation so he can go home to visit his parents.