When has the letter been discovered?: 15 years later.|5 years later.|50 years later.

In Canada, general elections must be held at least once every ___. A: 2 years B: 3 years C: 4 years D: 5 years

How long has Odysseus been away from home? A: 10 years B: 20 years C: 30 years D: 5 years

For how long had Mr. Smith been taking money A: 2 years B: 12 years C: 5 years D: 8 years

How many years later did the author become Mark’s Math teacher again A: 3 years B: 4 years C: 5 years D: 6 years

How often do we hold the Olympic Games A: Every 4 years B: Every 3 years C: Every 5 years

How long did the Vietnam War last? A: More than 5 years B: About 10 years C: About 20 years D: More than 25 years

We can survive for seven days without food, but we can survive ____ days without water? A: 3 years B: 5 years C: 6 years D: 7 years

There are usually ____years of elementary school, ___years of middle school (or junior high school), and ___ years of high school. A: 6; 3; 3 B: 5; 4; 3 C: 6; 2; 4 D: 5; 4; 3

Visual acuity improves gradually and is emmetropia at ( ) A: 6 months old B: 3 years old C: 4 years old D: 5 years old