根据汉语意思，完成英语句子，每空一词。
1. 当大量的移民到达加利福尼亚但没挖到金子时，他们很有可能非常失望。
________ ________ ________ ________ many immigrants were disappointed when arriving at California and finding no gold then.
2. 问题是有许多的移民不能实现梦想。
________ ________ ________ ________ a great percentage of immigrants couldn’t achieve their dreams.
3. 使他心烦的使她是否会接受那件礼物。
__________ annoyed him was ___________ she would receive the present.
4. 没有人想要这个屋顶塌陷的屋子。
Nobody wants the house ________ roof has fallen in.
5. 他们收到立刻完成工作的命令。
They received the order that the work _______ _______ at once.