－ What does the sign over there read － “No person ________ smoke or carry a lighted cigarette, cigar or pipe in this area”

1_____education is the instruction that occurs when the instructor and students are separated by distance or time,or both

Which do you think is ________, health or wealth？

29．__________ when you are on the bus or bike．

Either he or I ______to the airport.

原水加药后，经混凝使水中悬浮物和胶体形成大颗粒絮凝体，而后通过（）进行重力分离。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Duty is an act or a course of action that people ______you to take by social customs, law or religion.

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

_____city do you prefer, Shanghai or London?

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

Hurry up, or you ______ catch the train.