---- 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.
--- What has happened here?--- There was ______ accident here about an hour ago. ______ car hit a tree and ______ driver was killed.
We can’t get the machine to run. There must be ______ with it.
Only ______according to the directions can the medicine be quite effective.
--- I promise her daughter ______ get a nice present on her birthday.---Will it be a big surprise to her?
Before the final examination, many students have shown ______of tension. Some have trouble in sleeping while others have lost their appetite.