--- Mike, it’s a pity you didn’t come to last night’s concert.It was really great! --- Really? If I ________ so busy, I would have gone with you.
"We can't go out to play football in this rainy weather," said Bob, ________ out of the window disappointed.
The twins were so much alike; I could hardly ________ Tom.
By far, there are many problems ________ to be solved.
I don't think _________ possible to master a foreign language without much memory work.
The patient was warned ________ oily food after the operation.