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1. I ran into John in the supermarket . - It ... be John! He is in Italy now.
2. Sue is late. - She ... as she was working on the project all night long.
3. It ... today, so take your raincoat.
4. Dan ... ! He is a very honest person. - I agree. There must be a mistake.
5. You ... be very happy. - Sure ! My friend is coming back at last!
6. Poor Sarah! She failed her exam. - Yeh, but she ... harder.