Go straight into the cave and find out what’s in it, ________?[ ]

One of the most important problems we willhave to solve is ____of students’ learning method

下列各句，最得体的一句是

Not only my parents but also I interested in Chinese folk songs and Abao is our favorite singer.

Did you go to the cinema to see 3D The Hobbit last night— No, I ________ go to the cinema. The tickets are too expensive.