What does the below rebus riddle means?

Be active and find the killer in the picture Riddle below.

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

I know a nine-letter word having only one vowel.
Do you ?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

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

Can you count the number of blocks in the picture below?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes