按对原料的作用方式，自由开松形式有（）和（）；握持开松形式有（）和（）。
参考答案：自由撕扯；自由打击；握持打击；握持分割
John promised his doctor he()not smoke,and he has not smoked ever since.
A. might
B. should
C. could
D. would
墩布dūn bù
