Teaching and learning are parts of the same educational experience, but unfortunately they are often thought of ___________ separate.
How the big forest fire has ________ remains to be a mystery.
I’m waiting for the mail. Do you know _____ it will arrive?
His parents died when he was young, and he was_____ by his aunt.
–Did you plan to meet here? -- No, we met ____.
We don’t doubt _____ he will succeed in the research work.