----My son always goes to school without having ______ breakfast.----It is ______ unhealthy habit. You must ask him to change it.
--- He couldn’t hide his __________ at my success and said bad words about it.
--- Are you going to __________ this challenge?(挑战)
---The boy looks nice ________ white and the red sweater looks good ________ the girl.
--- We just need one of you for the game. ________you _______your brother can join us.
--- Cross the road carefully, __________ you’ll keep yourself safe. --- Thank you.