Put the verbs into correct form. The conference (1) ___ (begin) at nine. It (2) ___ (start) with an introductory session

The conference began at nine. It started with an introductory session and continued with a talk about sales performance. After that, we were divided into small groups and discussed various points. The discussion continued after lunch. After that, there is a plenary session which the Sales Director led. The first day finished at around six.