Which country gets ill every time?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

There are three identical triplets sisters. Demi is the oldest of them all and she always speaks the truth. Diana is the next one who is a liar always. Drew, the youngest of them all speaks both truth and lies randomly.

On a rainy day, a family friend Victor visited them. Since there were starkly identical, he was not able to recognize them. Thus to clarify, he asked one question to each one of them.

He started with the one standing on the left and asked, 'Which sister is in the middle of you three?' She answered, 'That's Demi.'

Then, he asked the one standing in the middle, 'What is your name?' She answered, 'I am Drew.'

Finally, he asked the one standing on the right, 'Who is standing in the middle?' She answered, 'She is Diana.'

Victor was left baffled. He asked the questions three times and received different answers every time.

Can you tell who was who?

Can you write down eight eights so that they add up to one thousand?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does below rebus means ?

What occurs twice in a week, once in a year but never in a day?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?