单项选择题
A．Once B．Three times C．Twice D．Four times
A．He was afraid that someone would steal his box. B．Because he wanted to climb up along the rope. C．He fastened the end of the rope in order to keep the box unmoved. D．Because he wanted to prevent the box from coming down.
A．will never touch alcohol and drugs B．feel that they become adults C．find alcohol and drugs are harmful to health D．believe alcohol and drugs can free themselves from mental sufferings and make them energetic