He was busy writing a story, only ____ once in a while to smoke a cigarette. A. to stop B stopping C to have stopped D having stopped
_______they say, just take your own way.
– Do you know you ______to be here by 7:30 ? --- Yes, I do.
There _____an old tree here. I wonder how they could manage to remove such an old tree.
– You seem to have learnt it by heart. --- Yes, I_________.
– He looks as if he _____the answer. --- He has.