题目内容：

下列各句中均有一处错误，指出并改正。

1. (2019•宁夏银川一中第一次月考)He is now in his thirties and has been teaching in almost ten years.

________________________________________________________________________

2. (2018•湖北省鄂东南省级示范高中教育教学改革联盟学校联考)By the time Kenny, 16, reached his third year of high school, he has become vice president of his school’s cooking club.

________________________________________________________________________

3. (2018•吉林省长春外国语学校高三月考)When times are hard and workers laid off, they receive very little.

________________________________________________________________________

4. (2018•新疆乌鲁木齐诊断)Next Sunday, the twenty-fifth of October, we have an open day at our school.

________________________________________________________________________

5. (2018•辽宁沈阳一模) Li Yuan did very well in her job. And then she runs a teahouse of her own.

________________________________________________________________________

6. (2018•兰州二模)When we arrived, we were warmly welcome by them.

________________________________________________________________________

7. (2018•福建福州十三中期中)Today I’ve got wonderful news to tell you. I had been offered a job at a company in England for my good performance.

________________________________________________________________________

8. (2018•甘肃天水一中一模)Since last winter, the smog has been occurred a lot of times.

________________________________________________________________________

9. (2018•安徽皖南八校联考)If our staffs determined that your clothes are not appropriate, you will be forbidden to enter the school.

________________________________________________________________________

10. (2016•四川成都外国语学校月考)One evening, a man visited me and after a while, he inquires about my studies.

________________________________________________________________________

11. (2018•河南省中原名校第一次质量考评)Without rain, our water supply would cut off and we would die.

________________________________________________________________________

12. (2018•广东仲元中学七校联合体考前冲刺交流)John went shopping in a store, but he forgot to bring a bag. So he buys a shopping bag.

________________________________________________________________________