John does important research _______ the best ways to help the old.
Thanks for your invitation, but I’m so sorry I can’t go. I need to ________ my baby at home.
I couldn’t do it ________ your great help. Thanks a lot!
There is _________ news about this movie star in the newspaper. Where can I get some?
--- Must I finish my homework now? -- No, you ________. You can go home now.
Could you say it again? I can’t understand __________ you are talking about.