the meaning of each idiomatic expressions and use them in a sentence

1. at the drop of a hat
it means without hesitation
- You know that he will do whatever you demand at the drop of a hat. So don\'t take him for granted.
>> Correct
2. a bird in the hand is worth two in the bush
it means that the thing you possess is better than the others you don\'t possess eventhough yours is less than them.
- Don\'t be jealous of Kevin because he already left the class. At least you are not sick. You have to remember that a bird in the hand is worth two in the bush.
>> Correct
3. come hell or high water
 it means that no matter what happens.
- I will leave here at 6 pm, come hell high water.

>>  Correct