Only when he failed the exam ________ that he didn’t work hard. (原创)

We should devote all our time ________ poor people.

Why did the teacher ask for me?— He wanted you to _________ your absence last night. [ ]

I’dlike to settle down somewhere ______the climate is mild and the sun shines allyear long

It is still under discussion __________the old bus station should be replaced with a modern hotel or not.