Thanks _____ telling me that. [ ]

What are you doing, Jack?—I’m looking for some information about the event ________ attracts all the people’s attention.

I’m going to the States for further study. —How long ____ you ___there?

They need to _______ some good ideas to help the old people in the Old People’s Home.

I like places _____ the weather is neither too hot nor too cold.[ ]