This is the story of two fogs （青蛙）.One fog was fat and the other was （1）

thin

thin

.One day，while searching for food ，they carelessly jumped into a vat（大桶）of（2）

milk

milk

.They couldn't get out，as the sides were too slippery （滑的），so they were just swimming around.
   The fat fog said to the thin fog， "Brother fog，there's no use swimming.We're just going to die. （3）

so

so

we might as well give up （放棄）." The thin frog said，"Hold on，Brother.Keep （堅(jiān)持） swimming.Someone will get us （4）

out

out

."And they went on swimming.
   （5）

After

After

a few hours，the fat frog said， "Brother frog，there is no use.I'm becoming very（6）

tired

tired

now.I am just going to stop swimming and die.It's（7）

Sunday

Sunday

and nobody is working today.No one will help （8）

us

us

.There's no possible way out of here." But the thin frog said， "Keep trying.Keep swimming."
   Two hours passed.The fat frog said， "I can't go on any longer.There is no use swimming." The fat frog stopped.He gave up and（9）

drowned

drowned

in the milk.But the thin frog kept swimming.
   Ten minutes later，the thin frog felt something solid （固體的） under his feet.He turned the milk into butter （黃油） （10）

and

and

jumped out of the vat.He saved himself.