________hard before, Tom is afraid of failing in the exam.
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.
–I must apologize for _____ ahead of time. –That's all right.
The Olympic Games, _____ in 776 BC., didn’t include women players until 1912. A. first played B. to be first played C. first playing D. to be first playing