24.　 We went to the concert at the ____________(邀请) of Mr Lin.

Keys:　

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SB 2B Units 21-23

23.　 This medicine is very v_________ and it cost me 500 francs.

22.　 I c_________ on Dick at his office yesterday.

21.　 Dogs r__________ people by their smell.

20.　 Scientists are keeping a s_________ deer alive in the center.

19.　 Milu deer used to be c__________ in China long ago.

18.　 We are g_________ encouraged by the teacher’s words.

17.　 Mrs Smith came to China last year and she lives in Hangzhou at p___________.

16.　 I thought ha had died, but in fact he is still a________.

15.　 The f____________ tried their best to put out the fire.