Under the Pollution Regulations，when you dump garbage in to the sea you must（）.
Be carefully when you（）the derrick.
When you write, （） all the necessary information.
You（） buy some reference books when you go to the college.
Acknowledgement by you of receipt of a distress message from a vessel which，beyond any possible doubt，is not in your vicinity and is a long distance away must be made when（）.
When you ( ) the bus,please wait in line.
What can you see to the west of the pyramid When you are standing at its top?
When you travel, the place you live is not an important factor.
You do the “Chop” gesture when you are very persuasive and when you convey an important fact that you are very sure of.
When you buy anything expensive, you should ask the dealer to give you the _______.
If the publisher sends the proof to you, when should you give a reply?
When you buy clothes, you must consider the material, quality and price.
164. When you doubt the existence of risk of collision ______
Which of the tips do you often use when you give a talk?
The price you pay when you purchase a Treasury bond is the _____ price.
You should accept a project when the:
When you move out of the house, you should ______the door keys to me.
You can see the ball __ when the temperature is high.
You are just the same______you were the day when I first met you.
--When did you feed the dog？ --____.
You should visit the part of the country when_____.
Will you please lend me the novel when you ______ ？
You _____ （）at the airport when you arrive.
You are buying from the market when you_____（）
