He couldn’t remember when he first listened to Obama’s speech, but he was sure it was ________ Monday because everybody was at ________ work.
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?