Have you given Mr. Li the message? — Not yet. I will give it to him as soon as he ______. [ ]

Tommy, _________ do you play the piano?—When my mom is at home, I have to every day, but she’s away this week!

Please talk______ Bill______ more information.[ ]

______ a certain doubt among the people as to the practical value of the project.

The sentence structure of “I saw him run into the building” is____________.