Where is Michael? —-He____TV at home ,I think.

Why are you so _______,Amy?—-I thought I lost my purse, but I didn’t. I found it in my study!

I once lived in a house _______ roof has fallen in.[ ]

When the teacher came into the classroom, the students ____ in groups.

His report was so exciting that it wasinterrupted by applause（掌声）.