Explain the meaning of sentences

1. She's a bright girl. Passing the exam is just a (piece of cake)
Meaning:

2. I (can't swim to save my life)
Meaning:

3. Most children fail to show courtesy nowadays. We must remind them of it. Don't (turn a blind eye) on that
Meaning:

4. The rain pours very hard. There's a (fat chance) for the program to commence
Meaning:

5. You can never find wallet anywhere in the house if you left it outside (you're barking at the wrong tree)
Meaning:

6. That new car would cost me (an arm and a leg)
Meaning:

7.(sleep tight) you will have a busy day tomorrow
Meaning:

8. I know I'm old for the role. (don't pull my legs)
Meaning:

9. I can never be wrong I received the information (from the horses' mouth
Meaning:

10. It is dangerous to push your plans of going out can't you see? (it is raining cats and dogs)?
Meaning:
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