2, 3, 5, 9, 17, _ What is the next number in the sequence?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

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

Who am I?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

What word begins and ends with an E, but has only one letter?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

If 1+9+8=1, what is 2+8+9?