The question is saying that Elena attended so it is past tense<span> and because it is referring to Elena it will be el/ella/usted conjugation.
Therefore: it is probably </span><span>asistió which means attended.
It could be ha </span>asistido though because ha <span>asistido means has attended but Elena has attended a conference does not sound as good as Elena attended a conference.
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1. Durante la semana, mis amigos y yo vamos a la playa.
2. Yo nado después de escuela durante la semana.
3. Ellos cocinan la cena en los fines de semana.
4. Ella le gusta cantar en la tarde.
5. Tu caminas desde escuela hasta su casa.
Hope this helps!
