Out of the blue
Break the ice
Recharge sb’s battery
Pull sb’s leg
Take sth with a pinch of salt
Be a far cry from sth
Sleep like a log
Give sb food for thought
Keep an eye out for sb/sth
In the middle of nowhere
Be a piece of cake
Make sb’s day
Make sb extremely happy
Do sth to get new energy and enthusiasm
Make people more relaxed in a new situation
Make you think seriously about a topic
A long way from any towns, villages or other houses.
Sleep very well without waking
Watch for somebody or something to appear
Tell sb sth that isn’t true as a joke
Completely unexpectedly
Not to believe sth to be accurate or true
Be very easy to do
Be completely different from sth