The students in a certain physical education class are on either the basketball team or the tennis team, are on both these teams, or are not on either team. If 15 students are on the basketball team, 18 students are on the tennis team, 11 students are on both teams, and 14 students are not on either of these teams, how many students are in the class?

The students in a certain physical education class are on either the football team or the basketball team, are on both these teams, or are not on either team. If 12 students are on the football team, 15 students are on the basketball team, 8 students are on both teams, and 9 students are not on either of these teams, how many students are in the class?

◆Topic 10：Work to Live or Live to Work?　　Questions for reference:　　1) Why do people live?　　2) Are people really aware of the reasons why they work?　　3) How do you balance work and life?

The goal, which they are unlikely to live to see , is tocure, prevent or manage all diseasesin the next 80or so years.

30．How many ways of travelling are mentioned(提到)in the passage?

If necessary to avoid collision or allow more time to（）the situation，a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion．

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

Why are many people on restricted or reduced diets?

How many expansion frames can be attached to an IBM TS3500 model L23 or L53 base frame? （）

What are two ways to verify if a WX device is configured as a hub, a spoke, or a mesh device? （）(Choose two.)