He devoted himself _______ to his research and got many achievements.

Though there was a heavy rain and terrible thunderstorm, the children slept  _____all night.

--- Is the food served in the restaurant tasty? ---I’m sure that       else in this town can you find a better restaurant.

 ---I was riding along the street and all of a sudden, a car cut in and knocked me down. ---You can never be         careful in the street.

We must be off _____. It’s eight o’clock already.