题目内容：

 

1.Could you ten me whether there is a c_________between smoking and lung cancer?

2.The condition prevents the blood from_________（循环）freely.

3._________（因此），we must treasure the time.

4.I would always keep my distance from drinkers on social_________（场合）.

5.Liu Wei,the famous armless piano player,has succeeded in having a(n)_________（杰出的）career.