The correct answer is 'went to bed'. To Hit the sack means to go to bed. After the long journey, he hit the sack as soon as he reached home.

The most appropriate meaning of the given idiom "In queer street" is "In debt." In queer street: in trouble, usually because of debt. Example: He will be in the queer street if he continues buying expensive things.

The idiom, 'to be in the doldrums' means 'to be depressed, low spirited or sluggish'. The use of the idiom can be seen in the following sentence: Harry has been in the doldrums ever since he lost his job as a print journalist.

The correct answer is- a positive outlook on life. Let's look at the meaning of the given idiom: Rose-coloured glasses- the tendency to see things in a positive light.

The correct answer is Always thinking of only one thing. Let's look at the meaning of the given idiom: One-track mind: used in reference to a person whose thoughts are preoccupied with one subject or interest.

The correct answer is 'at a fast pace'. In the given sentence 'On the double' is an idiom. The meaning of it is as follows: On the double: very quickly and without any delay.

The correct answer is "beyond one's capability to understand something". Key Points. Given Idiom: Over one's head means too complicated to be understood by one. For example, My jokes always seem to go over one's head.

The given idiom is 'a fair-weather friend'. This idiom means - a person whose friendship cannot be relied on in times of difficulty. For example: Don't rely on her, she is a fair-weather friend.