当你驾驶时,你应该注意观察交通信号灯You should _____ _____ ______ ______the traffic lights when you drive.

当你驾驶时,你应该注意观察交通信号灯
You should _____ _____ ______ ______the traffic lights when you drive.

You should 【pay attention to watching 】the traffic lights when you drive.