Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
It is necessary for the ship to contact（）for authorization prior to undertaking mitigating actions in an oil pollution incident.
When is it necessary for a TDA to be conducted on an installed IBM DS8800? （）
Is it necessary to ask for the information of the attendees?
/tr/ and / tʃ/ sound similar, so it is not necessary to distinguish them when speaking English.
When we interact with other people, it is important to give cues to help them understand how we are feeling, for example, various facial expressions.
On the 5th day of the 5th lunar month, Mongolians believe it is the date for them to worship fire.
It is not _______ for me to return all the books to the library now because I still need some of them for my research.
It is quite necessary for a competent teacher to have good manners and ________ knowledge.
Which way does the following paragraph use to start a topic? Many people smoke. They smoke because they think it makes them cooler and it is a good way for them to show their manhood.
1.The research team has made all necessary preparations for the project to start and they are frustrated to learn that it is to be put of indefinitely.( )
2.Your audience is looking for a human connection, not a robot spitting words at them. Thus it’s necessary to show our emotion in delivering a speech.
In order to earn money for his family, it is necessary for him to get a job.
It is more important for them to learn to think in the language than ____ the meaning of every word.
听力原文：When you have a dog it is necessary to care for it very carefully. In return you will be loved by your dog.
For those who want to get high returns, it is better for them to buy______.
It is necessary for a receptionist to keep a of visits.
Is it necessary for girls to be on a d to keep slim?
It is necessary for older people to ______.
Knowledge is a comfortable and necessary retreat and______for us in an advanced age; and if we do not plant it while young, it will give us no shade when we grow old.
In order for the RU-486 pill to be approved for use in such nations as the United States, it is necessary that______.
When a position is temporary and it doesn’t worth the trouble to recruit externally for the position, a company could then offer to pay bonuses of various types to current employees and entice them in
Generally speaking, it is necessary for the buyer to clearly specify a period of validity of the L／C when applying for the opening of L／C.（)
The nurse it popular among her patients because she is _________ full of thought for them.
