1.speak of the devil
、、、、、、、to be talking of someone when they arrive
2.set the world on fire
、、、、、、、to do something unusual or outstanding
3.you drive a hard bargain
、、、、、、 bargain well
4.take it easy
、、、、、、 to be careful
5.a frog in my throat
、、、、、、you can’t speak or you are losing your voise because of a problem in your throat