单项选择题
A．had B．when C．that D．as
（）, you'd better keep it away from kids. A．To be safe B...
单项选择题（）, you'd better keep it away from kids.
A．To be safe B．being safe C．That for safe D．As be safe
Courage, intelligence, and experience all （） overcome o...
单项选择题Courage, intelligence, and experience all （） overcome obstacles.
A．helps B．helping C．help D．helped
It is five years （） he left his hometown. A．when B．from...
单项选择题It is five years （） he left his hometown.
A．when B．from C．since D．while
