Choose the correct alternative to complete the series:
$ac\_\_\_\_cab\_\_\_\_baca\_\_\_\_aba\_\_\_\_acac$

If the numbers from $1$ to $45$ which are exactly divisible by $3$ are arranged in ascending order,with the minimum number at the top,which number would be at the ninth place from the top?

These questions are based on the following set of numbers.
$738, 495, 329, 653, 849$
If $1$ is added to the first digit of each number and $1$ is subtracted from the second digit,which number will be the largest?

What should come next in the following letter series?
$H, G, F, E, D, C, B, A, H, G, F, E, D, C, B, H, G, F, E, D, C, H$

Fill in the blank space for the given series with the correct alternative.
$1, 4, 9, 16, 25, (\ldots)$

Choose the correct alternative for the missing term.
$?, siy, oeu, kaq, gwm, cri$