Oh, look! Here's a photo __________ in my classroom at primary school. Can you recognize me in it?
I found John _____ the desk, _____ his homework carefully.
We must set about _____ our lesson for the mid-term examination.
I can't understand _____ at that poor child.
–Can you spare me some time? –I'm afraid not. I have lots of letters _____.
The patient was warned _____ oily food after the operation.