21.Many young people take_______ great interest in exploring _______ space.
A./ ; / B. a ; the C.the ; the D.a ; /
22.----Hello,,may I speak to Mr Li, please?
----________, please. He is coming.
A. Speaking B. Hang on C. OK D. Yes
23.He has been in hospital for a long time and he is ______now.
A.taking up B. picking up C. turning up D. doing up
