用动词的适当形式填空
When the film star _______ (appear),his fans went crazy and screamed at once.
It is a good idea________ (take) my dog out for a walk.
Please pay attention to _____________(take)care of this baby.
She has difficulty _______ (do) her homework.
Either Saturday or Sundy______ (be) OK. I will be free at the weekend.