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A quantum leap is a major step in the development of something, or in the improvement of something.
If someone's a queer fish, they are a bit strange and can sometimes behave in an unusual way.
If there's a question mark over someone, there's some doubt about their future or their ability to do something. If there's a question mark over something, there's some doubt about its quality or its authenticity.
You can say "it's only a question of time" before saying what you think will happen in the future.
If something is a quick fix, it's a quick and easy, but usually short-term, solution to a problem.
If you're a quick study, you can learn new things quickly.
If you're quaking in your boots, you are very frightened.
If you spend quality time with someone, you spend time doing things that enrich your lives and improve your relationship.
If you're as quick as a flash, or quick as a wink, or quick as lightning, you're very quick.
If you are quick off the mark, you are quick to react to an event or an opportunity.
If you are quick on the trigger, or quick on the draw, you act quickly when solving problems or answering questions.
If you are quick on the uptake, you're smart and you can understand things quickly.
If you do something as a quid pro quo, you do it on the understanding that something will be done for you in return.
If you're as quiet as a mouse, you're very quiet.
This phrase can be used to express the idea that one should stop doing something that's rewarding but risky before something bad happens.
If you've got quite a bit of something, or quite a lot of something, you have a fairly large amount of it.