---It’s time for class.---Let’s .A.begin B.begining C.beginning
---I don’t think _______ Maths is easy.
---Thanks for _________ the new chairperson.
--- 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.