Many people have been ill from a strange disease these days, ________ we’ve never heard of before.
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.