What is always in front of you but can’t be seen?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

By using 'because' continuously three times, can you make an English statement ?

What is at the end of a rainbow?

Can you name some countries which do not have the alphabet 'A' in them?

Which five letter word can be added at the end of below word to form a
valid word?

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What English word has three consecutive double letters?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

_ _ _ IE _ _
_ _ _ IE _
_ _ IE _ _
_ _ IE _
_ _ _ _ IE

Like you see, some letters have gone missing from these words that contain the IE pair at some or the other place. The letters that will be used to fill the blanks are given below. Use them and form meaningful words. Can you do that?

A, C, D, F, H, K, L, M, N, N, O, R, R, S, S, S, T, T, Y and Y.

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?