Choose the correct form: Before participating in the conference , they __ buy the entrance tickets. Bbl6epnTe of MH OTBeT: a. are going to b. shall C. will be able

The correct form is:a. are going toExplanation: The sentence is talking about a future plan or intention, so "are going to" is the most appropriate choice. It indicates that they have decided to buy the entrance tickets before participating in the conference.