Sam doesn't know the _____to this mathematical equation. Can you help him out?

After some ______,Betty successful solved this equation.

This is a ______ differential equation because the variable y only has one degree.

When the pitcher 投手 throws the baseball, it travels 移動 along a ______ in the air.

Oh,this equation is easy to solve . Give me some ______ and I'II show you how to find the vaule of y.

When you meet people for the first time , it is rude to ______the conversation. Insead, it is polite to ask questions about everyone, in the effort努力 to get to know them better.

The four mathematical operations 數學運算 are addition加法, subtraction 減法, _____ and division 除法.

This is a _____ differential equation because the variable y has two degrees.

Unfortunately, earthquakes and typhoons are natural _____ which often occur in Taiwan.