Don’t lose heart.If you work hard you’ll a successful electronic engineer.A. turnB. learn

问题补充：

Don’t lose heart.If you work hard,you’ll a successful electronic engineer.

A. turn

B. learn

C. have

D. make

答案：

A. turn

B. learn

C. have

(答案→)D. make

解析：turn变得,强调性质、状态、颜色的改变；make有素质成为……,能成为。试比较:He has turned traitor.他已经叛逆。且traitor前没有冠词。She will make a good teacher.她会成为一位好老师。另外两个选项learn学习,have拥有,与题干语言环境相差较远。