下列各句子中均有一处错误，请找出并改正。

1. He kept the boy to stand there for hours.                                            _______________

2. Students can't be made study all day.                                                  _______________

3. The teacher told John get his notebook in the office.                            _______________

4. Don't let children to play in the busy streets. It's dangerous.                 _______________

5. Mrs Pan makes her son practices playing the piano after school.          _______________

患者男性，45岁，上腹隐痛4个月，食欲差，体重下降近5kg。X线钡剂检查可见胃窦处较大壁内龛影，直径约2.5cm，边缘不规则。最可能的诊断是

A．表性胃炎

B．疣状胃炎

C．胃溃疡

D．胃癌

E．糜烂性胃炎