1. We had to start at exactly the same time,___________________(所以我们必须核准手表).
2. _________________________ (他是否是工作的合适人选)is still a controversial issue.
3. Fertilizer are used primary to enrich the soil and _______________________ (提高产量).
4. Sorry I didn’t realize ______________________(这是个如此敏感的问题).
5. According to my personal experience , ___________________ (微笑已带给我许多好处).
参考答案：
1. so we had our watches checked
2. Whether he is the right person for the job
3. to increase yield
4. it was such a sensitive issue
5.smile has done me a lot of good