21.Jack’s family _______ their holiday in Shanghai this time next week.
A.are enjoying B.are to enjoy
C.will enjoy D.will be enjoying
22.It is said that he will______ his uncle’s business when he is mature enough to deal with the pubic relations.
A.think over B.hand over C.take over D.go over
23.--Has your teacher returned from America yet?
--Yes, but he _______ here for only three days before his company sent him to Africa.
A.was B.has been C.will be D.would be