50 should be enough to be going on with.
50英镑该够应付一时半会儿的了。
There's building work going on next door.
邻居正大兴土木。
She wasn't slow to realize what was going on.
她很快意识到出了什么事。
You would know what was going on if you'd listened.
你若是注意听了，就会知道发生什么事了。
I can't concentrate with all that noise going on.
吵闹声不绝于耳，我无法集中精神。