r middle school students,some courses are compulsory, while others are ________.

_____ can you expect to get a pay rise. [ ]

Who on earth will take the place of him?— I’m afraid no one would like to ____ the challenge— It’s just too difficult a task. [ ]

The Chinese government promised that under no circumstances ________ the efforts to provide universal and low­cost health care.

No one couldtheirtears while watching the moving performances