Some experts think that language learning is much ___ for children as their tongues are more flexible.

In order to help people to see the performance at the same time, they gave a _____ broadcast. 

This bird is really lovely, and I’ve never seen ________ one. 

Netizens are frequently reminded to be ________ about revealing (透露) their personal information on the Internet.

As most of you seem confused, now I’m going to the __________ measures.