The first one:
A las tres, Pepe hablo con su novia por teléfono.
The second one doesn’t make much sense, it would be saying: I bought some black pants and my friend Mateo like a lot of money.
I added words in parentheses to make it make more sense:
Yo compré unos pantalones negros y (a) mi amigo mateo le gusta mucho (el) dinero.
The third one:
Después, nosotros comimos cerca de un mercado.
The drink i recommend in Spanish is water=<span>agua</span>
1
1 la semana pasada monté a caballo
2 Anteayer nosotros tomamos fotos del museo
3 El mes pasada ustedes mandaron tarjetas postales
4 ¿El año pasado tu acampaste en las montañas?
2
1 Visitaron.
2 Tomaron
3 Compro
4 Regateó
5 Mandaron
3
1 Si tomamos fotos pero no muchas, 20 más o menos.
2 Nadie me mandó tarjetas postales en vacaciones.
I can't see the last one, sorry :)
If you have to complete with a correct verb, this sentence should be complete in the following way;
"el horno ESTÁ en la cocina". This would mean that the oven IS in the kitchen.
the verb "está" derives from "estar." it is use in present tense and simple form because the noun is in singular. In this case, it would make reference to the place in which the oven is, the place in the house.