-Could I hang out with my friends?-___. You have to prepare for your math test.
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.