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
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