Como dizer "uma gota no oceano" em inglês

Português: uma gota no oceano
Inglês: a drop in the ocean (BrE), a drop in the bucket (AmE)


Exemplos:

1. 5000 new schools are to be built, but this is just a drop in the ocean for such a vast country.
2. The amount of money raised was a drop in the ocean compared to what we needed.
3. 'We need to stop spending so much.' 'OK. I'll buy a cheaper brand of toothpaste.' ''But that's just a drop in the bucket.''