--- Has Li Lei finished his work today? --- I have no idea, but he ______ it when I saw him this morning.
The speaker always talked about difficult things. His ideas hardly _____ to the audience.
—Why are you standing here? —I’m waiting for Shirley. She will be back _____.
By the year 2020 scientists _____ a lot of research on AIDS.
The former manager of the company was said _____ in an organized crime.
_____ is commonly believed that the play was written by Shakespeare.