报警开关按钮应为（）。
A.黄色
B.红色
C.绿色
D.白色
参考答案：A
Jenny says she might _____ a doctor in the future. [ ]
A. is
B. be
C. makes
D. to be
By the time a child is five, he _______ hundreds of hours of television.
A．will watch
B．will have watched
C．had watched
D．is watching
