At last we came to a mountain, at the top of which ______,
Besides Tom, ________ Crosettes have two other sons, __________ of whom are all interested in making model planes.
Nobody noticed the thief slip into the house because the lights happened to__________.
The news about the terrible flood there greatly discouraged __________ there for a sightseeing.
He's unlucky,and he's always suffering____________ luck one after another.
If you ____________ stop smoking, you can only expect to have a bad cough.