Jack is late again. It is ________ of him to keep others waiting.
In this factory, suggestions often have to wait for months before they are fully _____.
----__________?----It depends on what it is.
. ______ is quite natural; a beginner can't read the books written in English very quickly.
----You forgot your keys when you left home in the morning.----Good heavens, ___________.
Was it not until you began to work ______ how much time you had wasted?