吧下列句子合并为复合句

题目

吧下列句子合并为复合句
1.Are there UFOs?The scientists are not sure------------------.2.Robots will make humans lose their jobs.I'm sure------------------3.Will he come or not this evening?I'm not sure---------------4.He will win.He is sure--------------

答案

1.Are there UFOs?The scientists are not sure------------------The scientists are not sure if there are UFOs.科学家不确定是否有UFOs.
2.Robots will make humans lose their jobs.I'm sure------------------I'm sure that robots will make humans lose their jobs.我确信机器人将使人类失去工作.
3.Will he come or not this evening?I'm not sure---------------I'm not sure whether will he come this evening.我不确定他今晚是否回来.
4.He will win.He is sure--------------He is sure that he will win.他确信他会赢.