(届北京市海淀区高三下学期期中练习英语试卷)You cannot take back your words ______ they are out of your mouth.
I took the medicine but it didn't have any ___.
Waier, the ___ please!
Can you give me any ___ as to how I can improve my English?
His grandmother’s back was bent with ___.
It is ___ to observe traffic rules.