1. Second, differences in air pressure can cause building walls to explode when the tornado passes over.

a. Buildings may collapse during tornadoes because air pressure inside the building is different from air pressure outside.

b. Differences in air pressure can cause tornadoes to expand quickly, which destroys more buildings.

당연히 a죠?

2. If you are requesting information, state exactly what you need to know.
a. By stating what you know, you may be able to avoid asking awkward or difficult questions.

b. When you need information from someone, directly ask for the information you

need.

당연히 b죠?