29. Please _____yourself from smoking and spitting in public places, since the law forbids them.
    A. restrain   B. hinder   C. restrict   D. prohibit

restrain  限制，抑制（某人的行为）

hinder  阻碍，阻碍

restrict=put a limit  限制 (时速，物价等)

prohibit  禁止

hamper  妨碍，约束