1.Mrs. king kept w___ herself to see how much heavier she was getting.

2.This is really a humorous story.It makes all of us l___.
3.The dictionary is quite u___.l use it all the time.
4.The ice on the lake is a bit t___.you'd better not skate on it,or there may be danger.

1.weighing 【keep + Ving weigh 称重】
2.laugh 【make sb. do】
3.useful 【根据句意可知。】
4.thin【薄】

warning laughing useful thin 再看看别人怎么说的。