Solve the following series:
AZ, GT, MN, __, YB

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Buy me, smell me or deliver me, I do not change.

Who am I?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?

Can you find the missing piece of the Porsche?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?