1. Polar Bear in Danger Key words
master : The lion is the master of the jungle.
melt : Fiona’s ice cream melted in the hot sun.
behave: How did Mark behave in school today?
stable : Be careful. This chair is not very stable.
global warming: The global warming is an
important issue.
percent : 90 percent students are present today.

2. II. How to use it?
….not…at all: 一點也不
since & for : 自從
once (one time) : 一次 說
say : The report says that children don’t eat enough fruit.
speak : We can speak English and Chinese.
tell : Could you tell me when we will start?
talk : Leslie talked with her teacher after class.

3. III. Exercise: Please choose the right word in the blank.
_____ 1. (A) at once (B) at all (C) at a time (D) at best
_____ 2. (A) showing (B) causing (C) expecting (D) building
_____ 3. (A) Since (B) Also C) Once (D) However
_____ 4. (A) say (B) speak (C) tell (D) talk
_____ 5. (A) most hot (B) more hot (C)hotter (D) hottest