Directions: Read the following text and choose the most suitable heading from A-F for each paragraph．There is one extra heading which you do not need.

I have heard that fluoride can help stop dental decay, but I recently read that it is poisonous．Which of these is true? How can children use fluoride safely?

This question is answered by Dr Marcia M．Rich who practises general dentistry in Newholt．She is also a lecturer at the University and a writer for the monthly magazine Your Dentist Cares．

My answer to the first question is to stress that fluoride works well and is safe when users follow instructions．Young children have a tendency to swallow toothpaste, which is why they should only have a tiny amount of fluoride toothpaste on their toothbrush．If this simple measure is taken, parents can be confident that children will be protected against tooth decay, and come to no harm.

Almost all medicines have an adverse effect－or even be deadly－if they are not taken as directed．So you are right－fluoride can be poisonous if it is swallowed in very large quantities．It is for the reason that fluoride supplements can only be obtained on prescription from the doctor or dentist．Please be assured that fluoride overdoses are rare－in fact, I have never heard of any fatal incidents related to fluoride poisoning.

Scientific studies have shown that fluoride can help to prevent cavities as long as it is used correctly．If fluoride is abused, there is a risk of illness or even deaths in extreme cases．If a deadly amount of fluoride is taken, immediate first-aid could save a life．A person who has swallowed a large amount of fluoride will probably start vomiting．If not, the patient should be given milk or antacid and taken to the nearest hospital for emergency treatment.

Taking too much fluoride while teeth are growing can lead to a condition called dental fluorosis．The most likely cause is the swallowing of fluoride toothpastes by young children．It can also be caused by inappropriate use of fluoride drop or other fluoride supplements, for example when fluoride is already is already present in drinking water．  

Directions: Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need.

Interviewing is a skill that can be learned and the key lies in the “three-Ps” of planning, practice and preparation. Here are some tips on making a successful interview.

Prepare as well as you possibly can, search the web and research the background of the company and the people who you think are going to be interviewing you. Learn exactly what it is they do and exactly how you would fit in with the company. Most importantly try to understand the “culture” of the company. You need to communicate in a way that mirrors their company standards; this will show you can fit in that organization. Understand a little of what their competitors are doing. This will show you’ve bothered to find out where their position in the market is.

Just as important is your own personal preparation. Think about the key things you want to communicate and why you would be ideal for the job. Think about you can sound enthusiastic, without sounding desperate; how you can sell yourself. If they ask you a question, such as “tell me about your CV”, and you can’t do it fluently, you will find the interviewers will lose interest and you won’t get the job.

During the interview, be a very good listener and if you can find some common ground with your interviewers, you will have a big advantage over your competitors. The interview is basically an interaction between two people, so how you come across as a person is of upmost importance. As soon as you enter the company building, make sure everyone you meet is left with the impression that you are a pleasant person. Sometimes an interview question might seem very simple but, don’t be deceived, there is always a reason for them asking that question.

Generally wear a suit and tie, but it does depend on the job you are going for. You should have discovered, when you studied the company culture, what is expected. For media companies, for example, being smart but casual might be the style they want. They are looking for someone who is comfortable with himself or herself. In this case you should dress for who you are.

It is natural if you are nervous, in fact it is a good sign; it shows you are taking the interview seriously. However try to avoid nervous mannerisms, such as tapping your foot or playing with your hair. Positive body language is important, so adopt a good posture. If you slouch in your chair the interviewer will think you could be sloppy in your work as well. Positivity is essential in all aspects of your interview.

Directions:  Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need．