The retired professor, _____ in his new book in the past three years, hasn’t realized the decline in his health.
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.
If you read fast every day, you ______ improve your English.