Misc: In 1990 Lithauania, Estonia and ---------- hold their 1st joint session. ?

Questions

It has been estimated that the typical American will spend an average of -------- years of his/her life reading newspapers.?

The average 6-month accumulation of barnacles on the hull of a ship can produce enough drag to force the vessel to burn -------- percent more fuel than normal when cruising.?

An average of 51 cars a year overshoot and drive into the canals of -------------?

Banging your head against a wall can burn up to ----------- calories per hour.?

Based on population, Chinese Mandarin is the most commonly spoken language in the world. --------- follows in second place?