His father _____ to Nanjing. He _____ back next week.A. has been, is B has been, will be C. has gone, is D. has gone, will be
Your help made __________ for me to work out this problem.
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)