A smile________the mother’s face when the son walked onto the platform to receive the prize

Teachers have to constantly update their knowledge inorder to maintain their professional ____.

Where have you been — I_______in the heavy traffic OtherwiseI_______ here earlier

Mike has much difficulty ________ Chinese so he oftenasks me ________ help.

He likes ______, but he doesn’t like to ______ today because it too hot outside. [ ]