It was very cold outside and we hadto go, so we had to stay at home .

Listen! Kate is playing the piano in the next room. –It _______________be Kate. She has gone to Hangzhou to visit the Cross-sea Bridge.

What do you spend your time on ___ work and study? [ ]

Hi, Tom. Is this your dog?－No, it’s Cathy’s. _________ is at home now.

I rang you at about ten o’clock, but there was no reply. – Oh, that was probably ________ I was seeing the doctor.