I am surprised to see a _______ chair in the room.
If hehis legs yesterday, he _______ the Summer Palace with us now.
—Did you notice John was not at work today? —No.If _______ working,I would have noticed it.
—Tom didn’t come last night,did he? —No.I _______ have waited for him.A whole night was wasted.
I was on the highway when this car went past followed by a police car.They _______ at least 150 kilometers an hour.
Her suggestion that the first six units of the book _______ wasn’t paid much attention to.