——Mom, my little sister is crying all the time.——Mary, be ________! She feels unwell.You should take good care of her.
____ you play ____ piano ____ when you were young?
The ________ boy ___________ the fire on May 10th.
It’s necessary _____ the dog’s fur and play with it for _______.
We’ll vote ____ David, do you agree ____ me?
We’ll go hiking if it_________ rain tomorrow.