21 . —I’m sorry I broke your teapot.
— .
A．Forget it B．You are welcome C．Definitely D．Not really
22. Unfortunately, ____ stone hit him on ______ head and he got injured.
A. the; a B. a; 不填 C. a; the D. the ; the
23 . Could you give me a hand? It seems that my strength has _________.
A. used up B. been given out C. run out D. been run out
