It’s a pity that you ______ leave so soon. Your uncle will be home in 10 minutes and he misses you so much.
----__________?----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?
A man does not know the difficulty of anything_________ he does it personally.