The explorer traveled to several remote villages, _____a lot of unusual information.

I had planned for the house    closer to a river, but I was told there was a danger of flooding.

I didn't realize my mother loves me so such until I received her gift for my 18th birthday, a diary______ the process of my growth．

Much attention should be paid _________people’s living conditions.

The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.