1.Those second-hand¹ pianos are selling like hot cakes,if you want one,you'd better buy one now before they're all gone.
sell like hot cakes=sell very well or very quickly

2.Whenever I have to make a speech I get butterflies in my stomach.
get butterflies in one's stomach=ger nervous

3 He would do anything for his daughter.She was the apple of his eye.
be the apple of one's eye=be very precious to sb.

4 Lend me $30,please,Tom,I'm broke at the moment.
be broke=doesn't have any money

5 The accident was caused by a taxi driver jumping the green light.
jump the green light=doesn't wait for the traffic lights to change to green

6.You didn't think I was serious,did you,Joe! It was a joke! I was pulling your leg, that's all.
pull one's leg=tease someone,逗某人玩

7 Because the owner wanted a quick sale, the painting went for a song-only $1000.
If something "goes for a song",it is sold very cheaply

8 He caught the last train by the skin of his teech.
By the skin of one's teech=the person only just caught the last train;he almost missed it.

9 There was a shortage² of food; so you had to pay through the nose for what you could find.
To "pay through the nose"for something is to pay far more for something than it is really worth

10 If he finds out what you did with the company's money,he'll hit the roof.
hit the roof=get very angry

11 The sky got very dark and soon the rain began to bucket down.
bucket down = rain very heavily

12 They all chip in for the benefit of Simpson's widow³ and little child.
chip in=contribute money 捐献

13.He usually buys his clothes off the peg⁴.It's cheaper than going to a dressmaker.
Off the peg clothes =成衣

14 Now stop beating about the bush and tell me what happened!
beat about the bush=avoid saying directly what you mean

15 I really must go and lie down for a while ;I've got a splitting⁵ headache.
splitting headache=painful headache