The schedule isn’t _____, but we’d like to stick to it pretty closely.
set in stone
These small local protests are just _____.
the tip of the iceberg
Carmen’s so cheerful – she’s like _____ when she visits.
a breath of fresh air
Our contribution to the wildlife fund was just _____, but even small donations help.
a drop in the ocean
I’m feeling a bit _____ – I think I’m getting a cold.
under the weather
The whole future of the project is still _____. Nothing has been decided yet.
up in the air
Her instructions were _____. I couldn’t understand anything.
as clear as mud
He’s used to hard physical work – this is _____ to him.
a walk in the park